CLASS 552,	ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES
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SUBCLASSES

1	Azides
	This subclass is indented under subclass 1.  Compounds under Class 532, ... , which contain the azide group. (1) Note. The azide group has no single definite structure; it can be represented by different resonance forms, such as: and (2) Note. For simplicity, the azide group shall be structurally depicted in the following definitions as: SEE OR SEARCH CLASS: 588,  Hazardous or Toxic Waste Destruction or Containment,   subclass 408 for the chemical destruction of organic hazardous or toxic waste containing nitrogen.

2	With preservative or stabilizer
	This subclass is indented under subclass 1.  Products wherein the azide is mixed with a stabilizing or preserving agent, whose sole function is to prevent physical or chemical change.

3	Phoshorus attached directly or indirectly to the azide group by nonionic bonding
	This subclass is indented under subclass 1.  Compounds wherein the azide group is attached directly or indirectly to phosphorus by nonionic bonding. (1) Note. Examples of compounds provided for herein are:

4	Silicon, boron, aluminum or heavy metal containing
	This subclass is indented under subclass 1.  Compounds which contain silicon, boron, aluminum or heavy metal. (1) Note. Heavy metals are those whose specific gravity is greater than 4.00. (2) Note. Arsenic is considered as a metal.

5	Chalcogen or nitrogen bonded directly to the azide group (e.g., sulfonyl azides, etc.)
	This subclass is indented under subclass 1.  Compounds wherein the azide group is bonded directly to nitrogen or to chalcogen (i.e., oxygen, sulfur, selenium or tellurium). (1) Note. Examples of compounds provided for herein are:

6	Having -C(=X)-, wherein X is chalcogen, bonded directly to the azide group
	This subclass is indented under subclass 1.  Compounds wherein the azide group is bonded directly to -C(=X)-, in which X is chalcogen (i.e., oxygen, sulfur, selenium or tellurium). (1) Note. An example of a compound provided for herein is:

7	Chalcogen bonded directly to the -C(=X)- group
	This subclass is indented under subclass 6.  Compounds wherein the-C(=X)- group is also bonded directly to chalcogen. (1) Note. An example of a compound provided for herein is:

8	Benzene ring bonded directly to the azide group
	This subclass is indented under subclass 1.  Compounds wherein the azide group is bonded directly to a benzene ring. (1) Note. An example of a compound provided for herein is:

9	Cyclopentanohydrophenanthrene ring system containing
	This subclass is indented under subclass 1.  Compounds which contain the cyclopentanohydrophenanthrene ring system. (1) Note. The cyclopentanohydrophenanthrene ring system is depicted by the following structure, in which at least one of the rings A, B and C is not a benzene ring:

10	Acyclic carbon bonded directly to the azide group
	This subclass is indented under subclass 1.  Compounds wherein the azide group is bonded directly to acyclic carbon. (1) Note. An example of a compound provided for herein is:

11	Nitrogen attached indirectly to the azide group by acyclic nonionic bonding (e.g., diazides, etc.)
	This subclass is indented under subclass 10.  Compounds wherein the azide group is attached indirectly to nitrogen by acyclic nonionic bonding. (1) Note. An example of a compound provided for herein is:

12	Having -C(=X)-, wherein X is chalcogen, attached indirectly to the azide group by acyclic nonionic bonding
	This subclass is indented under subclass 11.  Compounds in which the azide group is attached indirectly to -C(=X)-, wherein X is chalcogen (i.e., oxygen, sulfur, selenium or tellurium), by acyclic nonionic bonding. (1) Note. An example of a compound provided for herein is:

100	Acyclic carbon bonded directly to three benzene rings and to cyano (e.g., triphenylacetonitrile, etc.)
	This subclass is indented under subclass 1.  Compounds under Class 532, ... wherein three benzene rings and a cyano group are bonded to the same acyclic carbon. (1) Note. An example of a compound provided for herein is:

101	Acyclic carbon bonded directly to three benzene rings or to two benzene rings and a cyclohexadienyl ring, which acyclic carbon may not be bonded to a fourth carbon (e.g., triphenylmethane dyestuffs, etc.)
	This subclass is indented under subclass 1.  Compounds under Class 532, ... , wherein either (a) three benzene rings or (b) two benzene rings and a cyclohexadienyl ring are bonded directly to the same acyclic carbon, which acyclic carbon may not be bonded to a fourth carbon. (1) Note. The triarylmethane dyestuffs are included within this subclass and its indents. (2) Note. To be classified in this subclass, a compound must contain carbon, hydrogen, and at least one additional element; hydrocarbon triarylmethanes are classified in Class 585. (3) Note. Examples of compounds provided for herein are:

102	With preservative or stabilizer
	This subclass is indented under subclass 101.  Products , wherein the compound is mixed with a stabilizing or preserving agent, whose sole function is to prevent physical or chemical change.

103	Heavy metal or alumium containing
	This subclass is indented under subclass 101.  Compounds which contain aluminum or heavy metal. (1) Note. Heavy metals are those whose specific gravity is greater than 4.00. (2) Note. Arsenic is considered as a metal.

104	Nitrogen, sulfur, phosphorus, or peroxy attached directly to the acyclic carbon by nonionic bonding
	This subclass is indented under subclass 101.  Compounds wherein the acyclic carbon is attached directly to nitrogen, sulfur, phosphorus or peroxy by nonionic bonding.

105	The acyclic carbon and an additional carbon are bonded directly to the same oxygen (ethers, esters, etc.)
	This subclass is indented under subclass 101.  Compounds wherein the same oxygen is bonded both to the acyclic carbon and to an additional carbon. (1) Note. Examples of compounds provided for herein are:

106	One of the rings, or a polycyclo ring system containing one of the rings, is bonded directly to -N=C=O or to -C(=O)OH (wherein H may be replaced by a group IA or IIA light metal, or by substituted or unsubstituted ammonium)
	This subclass is indented under subclass 101.  Compounds wherein-N=C=O or -C(=O)OH, in which H may be replaced by Group IA or IIA light metal or by substituted or unsubstituted ammonium, is bonded directly to one of the rings or to a polycyclo ring system containing one of the rings. (1) Note. Examples of compounds provided for herein are:

107	Chalcogen bonded directly to the ring or ring system (e.g., salicyclic type, hydroxynaphthoic type, etc.)
	This subclass is indented under subclass 106.  Compounds in which the ring, or the polycyclo ring system containing the ring, is further bonded directly to chalcogen (i.e., oxygen, sulfur, selenium or tellurium). (1) Note. An example of a compound provided for herein is:

108	One of the rings is part of a polycyclo ring system (e.g., naphthyldiphenylcarbinol, etc.)
	This subclass is indented under subclass 101.  Compounds wherein a polycyclo ring system is bonded directly to the acyclic carbon. (1) Note. An example of a compound provided for herein is:

109	An acyclic alkylene group is bonded directly to nitrogen and to chalcogen, cyano, carbonyl or additional nitrogen (e.g., N-hydroxyalkyl, N cyanoalkyl, N-sulfatoalkyl, aminoalkylamino groups, etc.)
	This subclass is indented under subclass 101.  Compounds wherein (a) nitrogen and (b) cyano, carbonyl, additional nitrogen, or chalcogen (i.e., oxygen, sulfur, selenium or tellurium) are bonded to the same acyclic alkylene group. (1) Note. Examples of compounds provided for herein are:

110	One of the rings and a benzene ring are bonded directly to the same nitrogen (e.g., triphenylrosaniline, etc.)
	This subclass is indented under subclass 101.  Compounds , wherein the same nitrogen is bonded to one of the rings and to a benzene ring. (1) Note. An example of a compound provided for herein is:

111	Nitrogen, except as cyano, attached indirectly to a ring by acyclic nonionic bonding (e.g., benzyl rosanilines, etc.)
	This subclass is indented under subclass 101.  Compounds wherein a ring is attached to nitrogen, except as cyano, by acyclic nonionic bonding. (1) Note. The compound may contain a cynao group, provided that an additional nitrogen is present which will satisfy the requirement of this subclass. (2) Note. Examples of compounds provided for herein are:

112	Carbon bonded directly to -S(=O)(=O)OH (wherein H may be replaced by a group IA or IIA light metal, or by substituted or unsubstituted ammonium; i.e., sulfonic acids and salts thereof)
	This subclass is indented under subclass 101.  Compounds wherein-S(=O)(=O)OH, in which H may be replaced by a Group IA or IIA light metal or by substituted or unsubstituted ammonium, is bonded directly to carbon.

113	Nitrogen bonded directly to one of the rings (e.g., malachite green, rosophenoline, etc.)
	This subclass is indented under subclass 101.  Compounds wherein one of the rings is bonded directly to nitrogen.

114	Nitrogen bonded directly to each of the rings (e.g., rosaniline, crystal violet, etc.)
	This subclass is indented under subclass 113.  Compounds wherein each of the rings is bonded directly to nitrogen.

115	Chalcogen bonded directly to one of the rings (e.g., fuchsone, etc.)
	This subclass is indented under subclass 101.  Compounds wherein one of the rings is bonded directly to chalcogen (i.e., oxygen, sulfur, selenium or tellurium).

200	Tetracyclo naphthacene configured ring system having at least one double bond between ring members and having oxygen bonded directly to a carbon of an interior ring which carbon is a member of one ring only
	This subclass is indented under subclass 1.  Compounds under Class 532, ... having the tetracyclo naphthacene ring configuration with at least one double bond between ring members and having oxygen bonded directly to a carbon of an interior ring, of the ring system, which carbon is a member of one ring only. (1) Note. The tetracyclo naphthacene configured ring is numbered as follows, for this subclass and its indents: (2) Note. This subclass contains, for example:

201	Two oxygens double bonded directly to the interior ring in para positions
	This subclass is indented under subclass 200.  Compounds wherein the interior ring, of the tetracyclo naphthacene configured ring system, has two oxygens double bonded directly thereto in para positions. (1) Note. This subclass contains, for example:

202	At least six oxygens bonded directly to the tetracyclo ring system
	This subclass is indented under subclass 200.  Compounds wherein the tetracyclo naphthacene configured ring system has at least six oxygens bonded directly thereto. (1) Note. This subclass contains, for example:

203	Nitrogen and carbonyl or cyano bonded directly to the tetracyclo ring system (e.g., tetracycline, etc.)
	This subclass is indented under subclass 202.  Compounds wherein the tetracyclo ring system has nitrogen and either the cyano or carboxyl group bonded directly to the same ring, e.g., tetracycline, etc. (1) Note. This subclass contains, for example:

204	Carbon double bonded directly to the tetracyclo ring system (e.g., 6 methylene tetracycline, etc.)
	This subclass is indented under subclass 203.  Compounds which additionally have carbon double bonded directly to the tetracyclo ring system, e.g., 6-methylene tetracycline, etc. (1) Note. This subclass contains, for example:

205	Plural nitrogens bonded directly to the tetracyclo ring system
	This subclass is indented under subclass 203.  Compounds wherein the tetracyclo ring system has plural nitrogens bonded directly thereto. (1) Note. This subclass contains, for example:

206	Processes
	This subclass is indented under subclass 203.  Processes of preparing, purifying or recovering the tetracyclo ring system compounds which have nitrogen and cyano or carbonyl bonded directly to them.

207	Heavy metal or aluminum containing material utilized
	This subclass is indented under subclass 206.  Processes in which an aluminum or heavy metal containing material is utilized.

208	Polycyclo ring system containing anthracene configured ring system having at least one double bond between ring members and having oxygen single bonded or any atom double bonded directly at the 9- and 10-positions (e.g., anthraquinones, etc.)
	This subclass is indented under subclass 1.  Compounds under Class 532, ... , having a polycyclo ring system which is or contains the anthracene ring configuration with at least one double bond between ring members and having oxygen single bonded or any atom double bonded directly to the ring system at the 9- and 10- positions. (1) Note. For this and indented subclasses, the anthracene-configured ring is numbered as follows: (2) Note. For this and indented subclasses, the anthraquinone, other than those provided for in this class (552), subclasses 268 through 270. (3) Note. This subclass contains processes of purification and separation of anthraquinone, per se. (4) Note. This subclass contains, for example:

209	Phosphorus, selenium, silicon, heavy metal or aluminum containing
	This subclass is indented under subclass 208.  Compounds which contain phosphorus, selenium, silicon, heavy metal or aluminum. (1) Note. This subclass contains, for example:

210	Nitrogen or carbon double bonded directly at the 9- or 10-position
	This subclass is indented under subclass 208.  Compounds wherein nitrogen or carbon is double bonded directly at the 9- or 10- position of the ring system. (1) Note. This subclass contains, for example:

211	Sulfur bonded directly to oxygen which is single bonded directly at the 9- or 10-position
	This subclass is indented under subclass 208.  Compounds wherein sulfur is bonded directly to the oxygen which is single bonded directly to the 9- or 10- position of the ring system. (1) Note. This subclass contains, for example:

212	The polycyclo ring system is bonded directly to an additional polycyclo ring system having at least three cyclos (e.g., plural anthracene configured ring systems bonded directly to each other, etc.)
	This subclass is indented under subclass 208.  Compounds wherein the polycyclo ring system is bonded directly to an additional polycyclo ring system which has at least three cyclos. (1) Note. This subclass contains, for example:

213	The polycyclo ring system and an additional polycyclo ring system having at least three cyclos are bonded directly to the same atom (e.g., plural anthracene configured ring systems bonded directly to the same sulfur, etc.)
	This subclass is indented under subclass 208.  Compounds wherein the polycyclo ring system and an additional polycyclo ring system which has at least three cyclos are bonded directly to the same atom. (1) Note. This subclass contains, for example:

214	The atom is nitrogen (e.g., anthrimides, etc.)
	This subclass is indented under subclass 213.  Compounds wherein nitrogen is the atom. (1) Note. This subclass contains, for example:

215	At least five cyclos in the polycyclo ring system
	This subclass is indented under subclass 214.  Compounds wherein the polycyclo ring system has at least five cyclos. (1) Note. This subclass contains, for example:

216	The polycyclo ring system is tetracyclic
	This subclass is indented under subclass 214.  Compounds wherein the polycyclo ring system is tetracyclic, i.e., is composed of four rings. (1) Note. This subclass contains, for example:

217	Nitrogen, oxygen, sulfur, carbon or halogen bonded directly at beta position of the anthracene configured ring system (i.e., 2-, 3-, 6- or 7 position)
	This subclass is indented under subclass 214.  Compounds wherein the anthracene configured ring system has halogen, sulfur, oxygen, nitrogen or additional carbon bonded directly to a beta position. (1) Note. This subclass contains, for example:

218	The polycyclo ring system is attached indirectly by nonionic bonding to an additional polycyclo ring system having at least three cyclos (e.g., plural anthracene ring systems attached indirectly to each other by nonionic bonding, etc.)
	This subclass is indented under subclass 208.  Compounds wherein a polycyclo ring system having at least three cyclos is attached indirectly to the anthracene configured ring system by nonionic bonding. (1) Note. This subclass contains, for example:

219	Nitrogen, oxygen, sulfur, carbon or halogen bonded directly at beta position of the anthracene configured ring system (i.e. 2-, 3-, 6- or 7 position)
	This subclass is indented under subclass 218.  Compounds wherein the anthracene configured ring system has halogen, sulfur, oxygen, nitrogen or additional carbon bonded directly at the beta position (i.e., 2-, 3-, 6- or 7- position). (1) Note. This subclass contains, for example:

220	The polycyclo ring system contains at least four cyclos
	This subclass is indented under subclass 208.  Compounds wherein the anthracene configured ring system is a part of a polycyclo ring system which has at least four cyclos. (1) Note. This subclass contains, for example:

221	Sulfur bonded directly at beta position (i.e., 2-, 3-, 6- or 7-position)
	This subclass is indented under subclass 208.  Compounds wherein a beta position (i.e., 2-, 3-, 6-, or 7- position) of the anthracene ring system has at least one sulfur bonded directly thereto. (1) Note. This subclass contains, for example:

222	Nitrogen or additional sulfur bonded directly to the sulfur
	This subclass is indented under subclass 221.  Compounds wherein the sulfur has nitrogen or additional sulfur bonded directly thereto. (1) Note. This subclass contains, for example:

223	Additional carbon bonded directly to the sulfur
	This subclass is indented under subclass 221.  Compounds wherein the sulfur has additional carbon bonded directly thereto. (1) Note. This subclass contains, for example:

224	Carbonyl, nitrogen, oxygen or halogen bonded directly at beta position (i.e., 2-, 3-, 6- or 7-position)
	This subclass is indented under subclass 221.  Compounds wherein a beta position (i.e., 2-, 3-, 6- or 7- position) of the anthracene configured ring system has halogen, oxygen, nitrogen or carbonyl bonded directly thereto. (1) Note. This subclass contains, for example:

225	Nitrogen bonded directly at alpha position (i.e., 1-, 4-, 5- or 8-position)
	This subclass is indented under subclass 221.  Compounds wherein an alpha position (i.e., 1-, 4-, 5-, or 8- position) of the anthracene configured ring system has nitrogen bonded thereto. (1) Note. This subclass contains, for example:

226	Oxygen, sulfur or halogen bonded directly at alpha position (i.e., 1-, 4-, 5- or 8-position)
	This subclass is indented under subclass 225.  Compounds wherein an alpha position (i.e., 1-, 4-, 5-, or 8- position) of the anthracene configured ring system has halogen, sulfur or oxygen bonded directly thereto. (1) Note. This subclass contains, for example:

227	Plural nitrogens, plural oxygens, plural sulfurs, or plural halogens bonded directly at alpha positions
	This subclass is indented under subclass 226.  Compounds wherein at least two alpha positions (i.e., 1-, 4-, 5-, or 8- position) of the anthracene configured ring system have the same atom bonded directly thereto. (1) Note. This subclass contains, for example:

228	Additional ring containing
	This subclass is indented under subclass 225.  Compounds which contain at least one additional ring. (1) Note. This subclass contains, for example:

229	Containing cyano or containing nitrogen bonded directly to sulfur (e.g., sulfonamide containing, etc.)
	This subclass is indented under subclass 228.  Compounds which contain cyano or contain nitrogen bonded directly to sulfur. (1) Note. This subclass contains, for example:

230	Acyclic carbonyl or thiocarbonyl containing (e.g., thiocarboxamide containing, etc.)
	This subclass is indented under subclass 228.  Compounds which contain acyclic carbonyl or thiocarbonyl. (1) Note. This subclass contains, for example:

231	Oxygen, sulfur or halogen bonded directly to the additional ring
	This subclass is indented under subclass 230.  Compounds wherein the additional ring has halogen, sulfur or oxygen bonded directly thereto. (1) Note. This subclass contains, for example:

232	Oxygen, sulfur, nitro or halogen bonded directly to the additional ring
	This subclass is indented under subclass 228.  Compounds wherein the additional ring has halogen, nitro, sulfur or oxygen bonded directly thereto. (1) Note. This subclass contains, for example:

233	Plural additional rings containing
	This subclass is indented under subclass 232.  Compounds which contain plural additional rings. (1) Note. This subclass contains, for example:

234	Sulfur bonded directly at alpha position (i.e., 1-, 4-, 5- or 8-position)
	This subclass is indented under subclass 208.  Compounds wherein an alpha position (i.e., 1-, 4-, 5-, or 8- position) of the anthracene configured ring system has sulfur bonded directly thereto. (1) Note. This subclass contains, for example:

235	Nitrogen or halogen bonded directly to the anthracene configured ring system
	This subclass is indented under subclass 234.  Compounds wherein the anthracene configured ring system has halogen or nitrogen bonded directly thereto. (1) Note. This subclass contains, for example:

236	Nitrogen bonded directly at beta position (i.e., 2-, 3-, 6- or 7-position)
	This subclass is indented under subclass 208.  Compounds wherein a beta position (i.e., 2-, 3-, 6-, or 7- position) of the anthracene configured ring system has nitrogen bonded directly thereto. (1) Note. This subclass contains, for example:

237	Oxygen, nitrogen or additional carbon bonded directly to the nitrogen
	This subclass is indented under subclass 236.  Compounds wherein the nitrogen has an additional carbon, an additional nitrogen or oxygen bonded directly thereto. (1) Note. This subclass contains, for example:

238	Nitrogen bonded directly at alpha position (i.e., 1-, 4-, 5- or 8-position)
	This subclass is indented under subclass 208.  Compounds wherein an alpha position (i.e., 1-, 4-, 5-, or 8- position) of the anthracene configured ring system has nitrogen bonded directly thereto. (1) Note. This subclass contains, for example:

239	Cyano bonded directly to the anthracene configured ring system
	This subclass is indented under subclass 238.  Compounds wherein the anthracene configured ring system has cyano bonded directly thereto. (1) Note. This subclass contains, for example:

240	Oxygen bonded directly at beta position (i.e., 2-, 3-, 6- or 7-position)
	This subclass is indented under subclass 238.  Compounds wherein a beta position (i.e., 2-, 3-, 6-, or 7- position) of the anthracene ring system has oxygen bonded directly thereto. (1) Note. This subclass contains, for example:

241	Additional carbon bonded directly to the oxygen
	This subclass is indented under subclass 240.  Compounds wherein the oxygen has an additional carbon bonded directly thereto. (1) Note. This subclass contains, for example:

242	The additional carbon is part of a ring
	This subclass is indented under subclass 241.  Compounds wherein the additional carbon is part of a ring. (1) Note. This subclass contains, for example:

243	Oxygen bonded directly at alpha position (i.e., 1-, 4-, 5- or 8-position)
	This subclass is indented under subclass 238.  Compounds wherein oxygen is bonded directly to a remaining alpha position (i.e., 1-, 4-, 5- or 8- position) of the anthracene configured ring system. (1) Note. This subclass contains, for example:

244	Halogen bonded directly to the anthracene configured ring system
	This subclass is indented under subclass 243.  Compounds wherein the anthracene configured ring system has halogen bonded directly thereto. (1) Note. This subclass contains, for example:

245	Carbon bonded directly to the anthracene configured ring system
	This subclass is indented under subclass 243.  Compounds wherein the anthracene configured ring system has carbon bonded directly thereto. (1) Note. This subclass contains, for example:

246	Oxygen bonded directly to the nitrogen (e.g., nitro bonded directly at 8 position, etc.)
	This subclass is indented under subclass 243.  Compounds wherein the nitrogen has oxygen bonded directly thereto. (1) Note. This subclass contains, for example:

247	Additional carbon bonded directly to the nitrogen
	This subclass is indented under subclass 243.  Compounds wherein the nitrogen has additional carbon bonded directly thereto. (1) Note. This subclass contains, for example:

248	Cyano, carboxamide, sulfonamide or halogen containing
	This subclass is indented under subclass 247.  Compounds which contain halogen, sulfonamide, carboxamide or cyano. (1) Note. This subclass contains, for example:

249	Halogen bonded directly to the anthracene configured ring system
	This subclass is indented under subclass 238.  Compounds wherein the anthracene configured ring system has halogen bonded directly thereto. (1) Note. This subclass contains, for example:

250	Carbonyl, oxygen or sulfur bonded directly to he nitrogen
	This subclass is indented under subclass 249.  Compounds wherein the nitrogen has sulfur, oxygen or carbonyl bonded directly thereto. (1) Note. This subclass contains, for example:

251	Carbon bonded directly to the anthracene configured ring system
	This subclass is indented under subclass 238.  Compounds wherein the anthracene configured ring system has carbon bonded directly thereto. (1) Note. This subclass contains, for example:

252	Nitrogen or halogen bonded directly to the carbon (e.g., carboxamide bonded directly to the anthracene configured ring system, etc.)
	This subclass is indented under subclass 251.  Compounds wherein the carbon has halogen or nitrogen bonded directly thereto. (1) Note. This subclass contains, for example:

253	Oxygen or sulfur bonded directly to the nitrogen (e.g., 1- nitroanthraquinone, etc.)
	This subclass is indented under subclass 238.  Compounds wherein the nitrogen has sulfur or oxygen bonded directly thereto. (1) Note. This subclass contains, for example:

254	Plural nitrogens bonded directly at alpha positions (i.e., 1-, 4-, 5- or 8 positions, e.g., 1, 5- dinitroanthraquinones, etc.)
	This subclass is indented under subclass 253.  Compounds wherein an additional nitrogen is bonded directly to a remaining alpha position (i.e., 1-, 4-, 5-, or 8- position) of the anthracene configured ring system. (1) Note. This subclass contains, for example:

255	Additional carbon bonded directly to the nitrogen
	This subclass is indented under subclass 238.  Compounds wherein the nitrogen has an additional carbon bonded directly thereto. (1) Note. This subclass contains, for example:

256	The additional carbon is part of a carbonyl group (i.e., carboxamido bonded directly at alpha position)
	This subclass is indented under subclass 255.  Compounds wherein the additional carbon is part of a carbonyl group (i.e., -N - C-). (1) Note. This subclass contains, for example:

257	Nitrogen, oxygen, sulfur or halogen bonded directly to an additional ring
	This subclass is indented under subclass 256.  Compounds wherein halogen, sulfur, oxygen or nitrogen is bonded directly to an additional ring. (1) Note. This subclass contains, for example:

258	The additional carbon is part of a ring or ring system
	This subclass is indented under subclass 255.  Compounds wherein the additional carbon is part of a ring or a fused ring system. (1) Note. This subclass contains, for example:

259	Oxygen, sulfur or halogen bonded directly to the ring or ring system
	This subclass is indented under subclass 258.  Compounds wherein the ring or fused ring system has halogen, sulfur or oxygen bonded directly thereto. (1) Note. This subclass contains, for example:

260	Acyclic carbonyl, sulfur or halogen containing
	This subclass is indented under subclass 255.  Compounds which contain halogen, sulfur or acyclic carbonyl. (1) Note. This subclass contains, for example:

261	Oxygen bonded directly at beta position (i.e., 2-, 3-, 6- or 7-position)
	This subclass is indented under subclass 208.  Compounds wherein at least one beta position (i.e., 2-, 3-, 6-, or 7- position) of the anthracene configured ring system has oxygen bonded directly thereto. (1) Note. This subclass contains, for example:

262	Oxygen bonded directly at alpha position (i.e., 1-, 4-, 5-, or 8-position)
	This subclass is indented under subclass 208.  Compounds wherein at least one alpha position (i.e., 1-, 4-, 5-, or 8- position) of the anthracene configured ring system has oxygen bonded directly thereto. (1) Note. This subclass contains, for example:

263	Halogen bonded directly at beta position (i.e., 2-, 3-, 6-, or 7-position)
	This subclass is indented under subclass 208.  Compounds wherein at least one beta position (i.e., 2-, 3-, 6-, or 7- position) of the anthracene configured ring system has halogen bonded directly thereto. (1) Note. This subclass contains, for example:

264	Halogen bonded directly at alpha position (i.e., 1-, 4-, 5- or 8-position)
	This subclass is indented under subclass 208.  Compounds wherein at least one alpha position (i.e., 1-, 4-, 5-, or 8- position) of the anthracene configured ring system has halogen bonded directly thereto. (1) Note. This subclass contains, for example:

265	Carbon bonded directly at beta position (i.e., 2-, 3-, 6- or 7-position)
	This subclass is indented under subclass 208.  Compounds wherein at least one beta position (i.e., 2-, 3-, 6-, or 7- position) of the anthracene configured ring system has carbon bonded directly thereto. (1) Note. This subclass contains, for example:

266	Nitrogen, halogen or additional oxygen containing
	This subclass is indented under subclass 265.  Compounds which contain halogen, nitrogen or additional oxygen. (1) Note. This subclass contains, for example:

267	Carbon bonded directly at alpha position (i.e., 1-, 4-, 5- or 8-position)
	This subclass is indented under subclass 208.  Compounds wherein at least one alpha position (i.e., 1-, 4-, 5-, or 8- position) of the anthracene configured ring system has carbon bonded directly thereto. (1) Note. This subclass contains, for example:

268	Processes of forming anthraquinone per se or enolic form thereof by reacting an organic acid, aldehyde, anhydride or an indane (e.g., reacting phthalic anhydride, methyl phenylindane, etc.)
	This subclass is indented under subclass 208.  Processes of forming anthraquinone, per se, or an enolic form thereof by utilizing an organic acid, an aldehyde, an anhydride or an indane as one of the reactants.

269	Processes of forming anthraquinone per se or enolic form thereof utilizing heavy metal containing material (e.g., vanadium catalyst utilized, etc.)
	This subclass is indented under subclass 208.  Processes wherein a heavy metal containing material is utilized to form anthraquinone, per se, or an enolic form thereof.

270	Light metal or nitrogen containing material utilized (e.g., ceric ammonium nitrate catalyst utilized, etc.)
	This subclass is indented under subclass 269.  Processes wherein either a nitrogen containing material or a light metal containing material is utilized.

271	Polycyclo ring system containing anthracene configured ring system having at least one double bond between ring members and having oxygen single bonded or any atom double bonded direct at the 9- or 10-position (e.g., anthrones, anthranois, etc.)
	This subclass is indented under subclass 1.  Compounds under Class 532, ... , having a polycyclo ring system which is or contains the anthracene configured ring system has at least one double bond between ring members and has oxygen single bonded or any atom double bonded directly at the 9- or 10- position of the ring system. (1) Note. For this and indented subclasses, the anthracene configured ring system is numbered as follows: (2) Note. This subclass contains, for example:

272	Phosphorus, selenium, tellurium, or heavy metal containing
	This subclass is indented under subclass 271.  Compounds which contain heavy metal, tellurium, selenium, or phosphorus. (1) Note. This subclass contains, for example:

273	The polycyclo ring system is bonded directly to an additional polycyclo ring system having at least three cyclo (e.g., plural anthracene configured ring systems bonded directly to each other, etc.)
	This subclass is indented under subclass 271.  Compounds wherein the polycyclo ring system is bonded directly to an additional polycyclo ring system having at least three cyclos. (1) Note. This subclass contains, for example:

274	The polycyclo ring system is attached indirectly by nonionic bonding to an additional polycyclo ring system having a least three cyclos (e.g., plural anthracene configured ring systems bonded directly to the same nitrogen, etc.)
	This subclass is indented under subclass 271.  Compounds wherein the polycyclo ring system is attached by nonionic bonding indirectly to an additional polycyclo ring system which has at least three cyclos. (1) Note. This subclass contains, for example:

275	The polycyclo ring system has at least ten cyclos
	This subclass is indented under subclass 271.  Compounds wherein the anthracene configured ring system is part of a polycyclo ring system which has at least ten cyclos. (1) Note. This subclass contains, for example:

276	The polycyclo ring system has nine cyclos
	This subclass is indented under subclass 271.  Compounds wherein the anthracene configured ring system is part of a nonacyclo ring system, i.e., a ring system composed of exactly nine cycles. (1) Note. This subclass contains, for example:

277	Cyano, nitrogen or sulfur bonded directly to the nonacyclo ring system
	This subclass is indented under subclass 276.  Compounds wherein the nonacyclo ring system has sulfur, nitrogen or cyano bonded directly thereto. (1) Note. This subclass contains, for example:

278	Halogen containing or processes wherein a halogen containing material is utilized
	This subclass is indented under subclass 277.  Compounds which contain halogen or processes under subclass 277 wherein a halogen containing material is utilized. (1) Note. This subclass contains, for example:

279	Oxygen single bonded directly to the nonacyclo ring system
	This subclass is indented under subclass 276.  Compounds wherein the nonacyclo ring system has oxygen single bonded directly thereto. (1) Note. This subclass contains, for example:

280	Halogen or light metal containing or processes wherein a halogen or light metal containing is utilized
	This subclass is indented under subclass 279.  Compounds which contain halogen or light metal or processes under subclass 279 wherein a halogen or light metal material is utilized. (1) Note. This subclass contains, for example:

281	Halogen containing
	This subclass is indented under subclass 276.  Compounds which contain halogen. (1) Note. This subclass contains, for example:

282	The polycyclo ring system has seven or eight cyclos
	This subclass is indented under subclass 271.  Compounds wherein the anthracene configured ring system is part of a ring system composed of seven or eight cycles. (1) Note. This subclass contains, for example:

283	Halogen containing
	This subclass is indented under subclass 282.  Compounds which contain halogen. (1) Note. This subclass contains, for example:

284	The polycyclo ring system has five of six cyclos
	This subclass is indented under subclass 271.  Compounds wherein the anthracene configured ring system is part of a ring system composed of five or six cycles. (1) Note. This subclass contains, for example:

285	Halogen containing
	This subclass is indented under subclass 284.  Compounds which contain halogen. (1) Note. This subclass contains, for example:

286	The polycyclo ring system has four cyclos (e.g., benzanthrones, etc.)
	This subclass is indented under subclass 271.  Compounds wherein the anthracene configured ring system is part of a ring system composed of four cyclos. (1) Note. This subclass contains, for example:

287	Cyano, carbonyl, nitrogen or sulfur bonded directly to the tetracyclo ring system
	This subclass is indented under subclass 286.  Compounds wherein the tetracyclo ring system has sulfur, nitrogen, carbonyl or cyano bonded directly thereto. (1) Note. This subclass contains, for example:

288	Halogen or carbon bonded directly to the tetracyclo ring system
	This subclass is indented under subclass 286.  Compounds wherein the tetracyclo ring system has carbon or halogen bonded directly thereto. (1) Note. This subclass contains, for example:

289	Nitrogen or sulfur bonded directly to the anthracene configured ring system
	This subclass is indented under subclass 271.  Compounds wherein the anthracene configured ring system has sulfur or nitrogen bonded directly thereto. (1) Note. This subclass contains, for example:

290	Carbon, halogen or plural oxygens bonded directly to the anthracene configured ring system
	This subclass is indented under subclass 271.  Compounds wherein the anthracene configured ring system has halogen, carbon or plural oxygens bonded directly thereto. (1) Note. This subclass contains, for example:

291	Cyclohexadiene having atoms double bonded directly at the 1- and 2- positions (e.g., orthoquinones, etc.)
	This subclass is indented under subclass 1.  Compounds under Class 532, ... , wherein atoms are double bonded directly to the 1- and 2- positions of a cyclohexadiene ring. (1) Note. For this and indented subclasses, the cyclohexadiene ring is numbered as follows: (2) Note. This subclass contains, for example:

292	Polycyclo ring system having the cyclohexadiene as one of the cyclos
	This subclass is indented under subclass 291.  Compounds wherein the cyclohexadiene is one of the cyclos in a polycyclo ring system. (1) Note. This subclass contains, for example:

293	Cyclohexadiene having atoms double bonded directly at the 1- and 4- positions (e.g., paraquinones, etc.)
	This subclass is indented under subclass 1.  Compounds under Class 532, ... , wherein atoms are double bonded directly at the 1- and 4- positions of a cyclohexadiene ring. (1) Note. For this and indented subclasses, the cyclohexadiene ring is numbered as follows: (2) Note. This subclass contains, for example:

294	Phosphorus, heavy metal or aluminum containing
	This subclass is indented under subclass 293.  Compounds which contain aluminum, heavy metal or phosphorus. (1) Note. This subclass contains, for example:

295	Polycyclo ring system having the cyclohexadiene as one of the cyclos
	This subclass is indented under subclass 293.  Compounds wherein the cyclohexadiene is part of a polycyclo ring system. (1) Note. This subclass contains, for example:

296	Oxygen double bonded directly at the 1- and 4- positions
	This subclass is indented under subclass 295.  Compounds wherein oxygen is double bonded directly at the 1- and 4- positions. (1) Note. This subclass contains, for example:

297	Nitrogen or halogen bonded directly to the polycyclo ring system
	This subclass is indented under subclass 296.  Compounds wherein the polycyclo ring system has halogen or nitrogen bonded directly thereto. (1) Note. This subclass contains, for example:

298	Chalcogen single bonded directly to the polycyclo ring system
	This subclass is indented under subclass 296.  Compounds wherein the polycyclo ring system has chalcogen (i.e., oxygen, sulfur, selenium or tellurium) single bonded directly thereto. (1) Note. This subclass contains, for example:

299	Carbon bonded directly to the polycyclo ring system
	This subclass is indented under subclass 296.  Compounds wherein the polycyclo ring system has carbon bonded directly thereto. (1) Note. This subclass contains, for example:

300	Plural oxygens and plural nitrogens bonded directly to the polycyclo ring system
	This subclass is indented under subclass 295.  Compounds wherein the polycyclo ring system has at least two oxygens and at least two nitrogens bonded directly thereto. (1) Note. This subclass contains, for example:

301	Nitrogen double bonded directly at the 1- and 4- positions
	This subclass is indented under subclass 293.  Compounds wherein the 1- and 4- positions of the cyclohexadiene have nitrogen double bonded directly thereto. (1) Note. This subclass contains, for example:

302	Nitrogen double bonded directly at the 1- or 4- positions
	This subclass is indented under subclass 293.  Compounds wherein the 1- or 4- position of the cyclohexadiene has nitrogen double bonded directly thereto. (1) Note. This subclass contains, for example:

303	Carbon double bonded directly at the 1- and 4- positions
	This subclass is indented under subclass 293.  Compounds wherein the 1- and 4- positions of the cyclohexadiene have carbon double bonded directly thereto. (1) Note. This subclass contains, for example:

304	Carbon double bonded directly at the 1- or 4- position
	This subclass is indented under subclass 293.  Compounds wherein the 1- or 4- position of the cyclohexadiene has carbon double bonded directly thereto. (1) Note. This subclass contains, for example:

305	Sulfur bonded directly at the 2-, 3-, 5- or 6- position
	This subclass is indented under subclass 293.  Compounds wherein sulfur is bonded directly to any of the remaining positions of the cyclohexadiene ring (i.e., 2-, 3-, 5-, or 6- position). (1) Note. This subclass contains, for example:

306	Nitrogen bonded directly at the 2-, 3-, 5- or 6- position
	This subclass is indented under subclass 293.  Compounds wherein nitrogen is bonded directly to any of the remaining positions of the cyclohexadiene ring (i.e., 2-, 3-, 5-, or 6- position). (1) Note. This subclass contains, for example:

307	Oxygen bonded directly at the 2-, 3-, 5-, or 6- position
	This subclass is indented under subclass 293.  Compounds wherein oxygen is bonded directly to any of the remaining positions of the cyclohexadiene ring (i.e., 2-, 3-, 5-, or 6- position). (1) Note. This subclass contains, for example:

308	Halogen bonded directly at the 2-, 3-, 5-, or 6- position
	This subclass is indented under subclass 293.  Compounds wherein halogen is bonded directly to any of the remaining positions of the cyclohexadiene ring (i.e., 2-, 3-, 5-, or 6- position). (1) Note. This subclass contains, for example:

309	Carbon donded directly at the 2-, 3-, 5- or 6- position
	This subclass is indented under subclass 293.  Compounds wherein carbon is bonded directly to any of the remaining positions of the cyclohexadiene ring (i.e., 2-, 3-, 5-, or 6- position). (1) Note. This subclass contains, for example:

310	At least three carbons bonded directly to the cyclohexadiene
	This subclass is indented under subclass 309.  Compounds wherein at least three carbons are bonded directly to the cyclohexadiene ring. (1) Note. This subclass contains, for example:

500	Cyclopentanohydrophenanthrene ring system wherein two nonadjacent carbons of the ring system are bonded directly to each other (e.g., 3,5 cyclocholesterols, 3,5-cycloandrostanes, etc.)
	This subclass is indented under subclass 1.  Compounds under Class 532, ... , containing a cyclopentano-hydrophenanthrene ring system configuration wherein two nonadjacent carbons of the ring system are bonded directly to each other and which may contain double bonds between ring members. (1) Note. An example of a compound provided for herein is:

501	Oxygen bonded directly at the 6-position of the cyclopentanohydrophenanthrene ring system
	This subclass is indented under subclass 500.  Compounds wherein oxygen is bonded directly at the 6-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

502	Cyclopentanohydrophenanthrene ring system containing
	This subclass is indented under subclass 1.  Compounds under Class 532, which have the basic structure in Fig. 1 below: Which may contain double bonds between its ring members. (1) Note. The phenanthrene portion of this tetracyclic ring system cannot be completely aromatic; it must be hydrogenated to some degree. (2) Note. In the indents hereunder which refer to positions, the numbers shown in this definition are employed. (3) Note. Included herein are compounds which contain an additional ring fused to one or more of the rings of the cyclopentanohydrophenanthrene ring system. See subclasses 510-514. (4) Note. The following structure shows the numbering system for substituents at the 17-position of the cyclopentanohydrophenanthrene ring system: (5) Note. A substituent at the 17-position of the cyclopentano-hydrophenanthrene ring system is designated as alpha or beta depending upon the stereochemical configuration thereof. A 17 beta-substituent is normally written or drawn directly above the 17-carbon atom and attached thereto by a solid line; a 17-alpha substituent is normally written or drawn to the right of the 17-carbon atom and attached thereto by dotted lines. The drawings below illustrate a cyano substituent as both a 17-beta and 17-alpha substituent. 17B-cyano-3, 16a-diacetoxyestr -1,3,5(10)-trien-17a-ol 17a-cyano-3, 16a-diacetoxyestra-1,3,5,(10)-trien-17B-ol SEE OR SEARCH THIS CLASS, SUBCLASS: 653, for Vitamin D compounds, calciferols, cholecalciferols, ergocalciferols, activated ergosterols, activated 7-dehydrocholesterols, irradiated ergosterol, irradiated 7-dehydrocholesterol, antirachitic vitamins, dihydrotachysterols, and 3,5-cyclovitamin D compounds. SEE OR SEARCH CLASS: 514,  Drug, Bio-Affecting and Body Treating Compositions,   subclasses 169+ for a medicinal composition including a cyclopentanohydrophenanthrene compound. 536,  Organic Compounds,   subclasses 5+ for steroid glucosides, e.g., digitalis glucosides. 540,  Organic Compounds,   subclasses 2+ for cyclopentanohydrophenanthrene compounds containing a heterocyclic nucleus.

503	With preservative or stabilizer
	This subclass is indented under subclass 502.  Products which contain a compound having a cyclopenthanohydrophenanthrene ring system in admixture with a preserving or stabilizing agent whose sole function is to prevent physical or chemical change.

504	Heavy metal or aluminum containing
	This subclass is indented under subclass 502.  Compounds which include aluminum or a metal having a specific gravity greater than four. (1) Note. Arsenic is considered a heavy metal. (2) Note. An example of a compound provided for herein is:

505	Boron, silicon, selenium or tellurium containing
	This subclass is indented under subclass 502.  Compounds which contain boron, silicon, selenium or tellurium.

506	Phosphorus attached directly or indirectly to the cyclopentanohydrophenanthrene ring system by nonionic bonding
	This subclass is indented under subclass 502.  Compounds wherein phosphorus is attached directly or indirectly to the cyclopentanohydrophenanthrene ring system by nonionic bonding. (1) Note. An example of a compound provided for herein is:

507	The phosphorus is bonded directly at the 21-position or is bonded directly to a chalcogen which is bonded directly at the 21-positon
	This subclass is indented under subclass 506.  Compounds wherein the phosphorus is bonded directly to the carbon at the 21-position of the acyclic carbon chain that is bonded directly at the 17-position of the cyclopentanohydrophenanthrene ring system or is bonded directly to a chalcogen which is bonded directly at the 21-position of the acyclic carbon chain that is bonded directly at the 17-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

508	Spiro
	This subclass is indented under subclass 502.  Compounds which contain a spiro ring system. (1) Note. An example of a compound provided for herein is:

509	Plural cyclopentanohydrophenanthrene ring systems
	This subclass is indented under subclass 502.  Compounds which contain at least two cyclopentanohydrophenanthrene ring systems. (1) Note. An example of a compound provided for herein is:

510	The cyclopentanohydrophenanthrene ring system is part of a polycyclo ring system having at least five cyclos
	This subclass is indented under subclass 502.  Compounds in which the cyclopentanohydrophenanthrene ring system and at least one additional ring are parts of a polycyclo ring system having at least five cyclos. (1) Note. An example of a compound provided for herein is: SEE OR SEARCH THIS CLASS, SUBCLASS: 500+, for cyclogonanes, e.g., 3,5-cyclocholesterols, 3,5-cycloandrostanes, 5,9-cyclopregnanes, etc.

511	The additional ring shares the 1,2-positions of the cyclopentanohydrophenanthrene ring system
	This subclass is indented under subclass 510.  Compounds in which additional ring is ortho-fused to the A ring of the cyclopentanohydrophenanthrene ring system at the 1,2-positions. (1) Note. An example of a compound provided for herein is:

512	The additional ring shares the 5,10- or 5,19-positions of the cyclopentanohydrophenanthrene ring system
	This subclass is indented under subclass 510.  Compounds in which the additional ring shares the 5,10- or 5,19-positions of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

513	The additional ring shares the 6,7-positions of the cyclopentanohydrophenanthrene ring system
	This subclass is indented under subclass 510.  Compounds in which the additional ring is otho-fused to the B ring of the cyclopentanohydrophenanthrene ring system at the 6,7-positions. (1) Note. An example of a compound provided for herein is:

514	The additional ring shares the 16,17-positions of the cyclopentanohydrophenanthrene ring system
	This subclass is indented under subclass 510.  Compounds in which the additional ring is ortho-fused to the D ring of the cyclopentanohydrophenanthrene ring system at the 16,17-positions. (1) Note. An example of a compound provided for herein is:

515	Nitrogen bonded directly to the cyclopentanohydrophenanthrene ring system
	This subclass is indented under subclass 502.  Compounds in which nitrogen is bonded directly to the cyclopentanohydrophenanthrene ring system. (1) Note. Examples of compounds provided for herein are:

516	The nitrogen is double bonded to the cyclopentanohydrophenanthrene ring system
	This subclass is indented under subclass 515.  Compounds in which the nitrogen is double bonded to the cyclopentanohydrophenanthrene ring system. (1) Note. Examples of compounds provided for herein are:

517	The nitrogen is part of a semicarbazone or thiosemicarbazone group
	This subclass is indented under subclass 516.  Compounds wherein the nitrogen is part of a semicarbazone or thiosemicarbazone group. (1) Note. An example of a compound provided for herein is:

518	Additional nitrogen bonded directly to the nitrogen (e.g., hydrazones, etc.)
	This subclass is indented under subclass 516.  Compounds wherein an additional nitrogen is bonded directly to the nitrogen. (1) Note. An example of a compound provided for herein is:

519	Oxygen bonded directly to the nitrogen (e.g., oximes, isonitrosos, etc.)
	This subclass is indented under subclass 516.  Compounds wherein oxygen is bonded directly to the nitrogen. (1) Note. An example of a compound provided for herein is:

520	The nitrogen is bonded directly at the 3-position
	This subclass is indented under subclass 519.  Compounds wherein the nitrogen is bonded directly at the 3-position of the cyclopentanohydrophenanthrene ring system.

521	The nitrogen is bonded directly at the 3-position
	This subclass is indented under subclass 515.  Compounds wherein the nitrogen is bonded directly at the 3-position of the cyclopenthanohydrophenanthrene ring system.

522	The nitrogen is bonded directly at the 17-position
	This subclass is indented under subclass 515.  Compounds wherein the nitrogen is bonded directly at the 17-position of the cyclopentanohydrophenanthrene ring system.

523	Sulfur bonded directly to the cyclopentanohydrophenanthrene ring system
	This subclass is indented under subclass 502.  Compounds in which sulfur is bonded directly to the cyclopentanohydrophenanthrene ring system.

524	The sulfur is bonded directly at the 1- or 3-position
	This subclass is indented under subclass 523.  Compounds wherein the sulfur is bonded directly at the 1- or 3-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

525	The sulfur is bonded directly at the 16- or 17-position
	This subclass is indented under subclass 523.  Compounds wherein the sulfur is bonded directly at the 16- or 17-position of the cyclopentanohydrophenanthrene ring system.

526	Carbon double bonded directly to the cyclopentanohydrophenantrene ring system
	This subclass is indented under subclass 502.  Compounds in which carbon is double bonded directly to the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provide for herein is:

527	The carbon is double bonded directly at the 2-position
	This subclass is indented under subclass 526.  Compounds wherein the carbon is double bonded directly at the 2-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

528	The carbon is double bonded directly at the 16-position
	This subclass is indented under subclass 526.  Compounds wherein the carbon is double bonded directly at the 16-position of the cyclopentanohydrophenanthrene ring system.

529	And carbon bonded directly at the 17 beta-position is a member of an acyclic chain of two or more uninterrupted carbons
	This subclass is indented under subclass 528.  Compounds wherein carbon bonded directly at the 17 beta-position of the cyclopentanohydrophenanthrene ring system is a member of an acyclic chain of two or more uninterrupted carbons. (1) Note. An example of a compound provided for herein is:

530	The carbon is double bonded directly at the 17-position (e.g., fusidic acids, etc.)
	This subclass is indented under subclass 526.  Compounds wherein the carbon is double bonded directly at the 17-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

531	Nitrogen or sulfur containing
	This subclass is indented under subclass 530.  Compounds which contain nitrogen or sulfur.

532	The carbon is a member of an acyclic chain of exactly two carbons (e.g., 3 keto-4,17(20)-pregnadienes, 17-ethylidene-estranes,etc.)
	This subclass is indented under subclass 530.  Compounds wherein the carbon bonded directly at the 17-position of the cyclopentanohydrophenanthrene ring system is a member of an acyclic chain of exactly two carbons. (1) Note. An example of a compound provided for herein is:

533	Plural oxygens bonded directly to the cyclopentanohydrophenanthrene ring system
	This subclass is indented under subclass 532.  Compounds wherein plural oxygens are bonded directly to the cyclopentanohydrophenanthrene ring system.

534	And oxygen bonded directly at the 21-position of the compound
	This subclass is indented under subclass 533.  Compounds wherein oxygen is bonded directly to the carbon at the 21-position of the acyclic carbon chain that is bonded directly at the 17-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein:

535	Halogen bonded directly at the 12-position of the cyclopentanohydrophenanthrene ring system
	This subclass is indented under subclass 502.  Compounds wherein halogen is bonded directly at the 12-position of the cyclopentanohydrophenanthrene ring system.

536	Halogen bonded directly at the 16-position of the cyclopentanohydrophenanthrene ring system
	This subclass is indented under subclass 502.  Compounds wherein halogen is bonded directly at the 16-position of the cyclopentanohydrophenanthrene ring system.

537	Plural halogens bonded directly at the 16-position
	This subclass is indented under subclass 536.  Compounds wherein plural halogens are bonded directly at the 16-position of the cyclopentanohydrophenanthrene ring system.

538	Carbon bonded directly at the 17 beta-position is a member of an acyclic chain of two or more uninterrupted carbons
	This subclass is indented under subclass 536.  Compounds wherein carbon bonded directly at the 17 beta-position of the cyclopentanohydrophenanthrene ring system is a member of an acyclic chain of two or more uninterrupted carbons. (1) Note. An example of a compound provided for here in is:

539	Halomethyl bonded directly to the cyclopentanohydrophenanthrene ring system (e.g., 16-trifluoromethyl progesterones, etc.)
	This subclass is indented under subclass 502.  Compounds wherein halomethyl is bonded directly to the cyclopentanohydrophenanthrene ring system. (1) Note. Examples of compounds provided for herein are:

540	Carbon bonded directly at the 17 beta-position of the cyclopentanohydrophenanthrene ring system is a member of an acyclic chain of six or more uninterrupted carbons (e.g., sterols, etc.)
	This subclass is indented under subclass 502.  Compounds wherein carbon bonded directly at the 17 beta-position of the cyclopentanohydrophenanthrene ring system is a member of an acyclic chain of six or more uninterrupted carbons. (1) Note. An example of a compound provided for herein is: SEE OR SEARCH THIS CLASS, SUBCLASS: 653, for Vitamin D compounds, calciferols, cholecalciferols, ergocalciferols, activated ergosterols, activated 7-dehydrocholesterols, irradiated ergosterol, irradiated 7-dehydrocholesterol, antirachitic vitamins, dihydrotachysterols and 3,5-cyclovitamin D compounds. SEE OR SEARCH CLASS: 514,  Drug, Bio-Affecting and Body Treating Compositions,   subclasses 169+ for a medicinal composition including a sterol compound.

541	Oxygen bonded directly at the 1-, 2-, or 4-position
	This subclass is indented under subclass 540.  Compounds wherein oxygen is bonded directly at the 1-, 2-, or 4-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

542	Oxygen bonded directly at the 6- or 7-position
	This subclass is indented under subclass 540.  Compounds wherein oxygen is bonded directly at the 6- or 7-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

543	Carbon or halogen bonded directly at the 6- or 7-position
	This subclass is indented under subclass 540.  Compounds wherein carbon or halogen is bonded directly at the 6- or 7-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

544	Exactly one oxygen bonded directly to the cyclopentanohydrophenanthrene ring system (e.g., cholesterols, cholestanols, stigmasterols, etc.)
	This subclass is indented under subclass 540.  Compounds in which exactly one oxygen is bonded directly to the cyclopentanohydrophenanthrene ring system. (1) Note. Lanolin is provided for in this subclass. (2) Note. An example of a compound provided for herein is:

545	Processes of isolating, purifying or recovering from animal, vegetable or fungal sources (e.g., wool fat or grease, lanolin, fish oils, animal tissue, soybean oil, tall oil or pitch, wood products, sugar cane, soap stocks, yeast, molds, etc.)
	This subclass is indented under subclass 544.  Processes which include isolating, purifying or recovering the cyclopentanohydrophenanthrene containing compound from animal, vegetable or fungal sources.

546	Halogen or oxygen bonded directly to the acyclic carbon chain at the 17 beta-position (e.g., 25-hydroxy cholesterols, etc.)
	This subclass is indented under subclass 544.  Compounds in which halogen or oxygen is bonded directly to the acyclic carbon chain at the 17 beta-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

547	Unsaturation between the 7- and 8-positions (e.g., ergosterols, 7 dehydrocholesterols, provitamin D, etc.)
	This subclass is indented under subclass 544.  Compounds which contain a double bond between the 7- and 8-positions of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is: SEE OR SEARCH THIS CLASS, SUBCLASS: 653, for Vitamin D compounds, calciferols, cholecalciferols, ergocalciferols, activated ergosterols, activated 7-dehydrocholesterols, irradiated ergosterol, irradiated 7-dehydrocholesterol, antirachitic vitamins, dihydrotachysterols and 3,5-cyclovitamin D compounds.

548	Carbon bonded directly at the 17 beta-position of the cyclopentanohydrophenanthrene ring system is a member of an acyclic chain of five uninterrupted carbons (e.g., choladienes, cholanic acids, etc.) stocks, yeast, molds, etc.)
	This subclass is indented under subclass 502.  Compounds wherein carbon bonded directly at the 17 beta-position of the cyclopentanohydrophenanthrene ring system is a member of an acyclic chain of five uninterrupted carbons. (1) Note. Bile acids are provided for in this subclass and the subclasses indented hereunder, i.e., 549-552. (2) Note. Examples of compounds provided for herein are:

549	Oxygen bonded directly at the 12-position (e.g., cholic acids, desoxycholic acids, dehydrocholic acids, etc.)
	This subclass is indented under subclass 548.  Compounds wherein oxygen is bonded directly at the 12-position of the cyclopentanohydrophenanthrene ring system. (1) Note. Examples of compounds provided for herein are:

550	Halogen, nitrogen, or sulfur containing (e.g., glycocholic acids, taurocholic acids, etc.)
	This subclass is indented under subclass 549.  Compounds which contain halogen, nitrogen or sulfur.

551	Oxygen bonded directly at the 6- or 7-position (e.g., chenodeoxycholic acids, ursodeoxycholic acids, etc.)
	This subclass is indented under subclass 548.  Compounds wherein oxygen is bonded directly at the 6- or 7-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

552	Exactly one oxygen bonded directly to the cyclopentanohydrophenanthrene ring system (e.g., 3-hydroxycholanic acids, lithocholic acids, etc.)
	This subclass is indented under subclass 548.  Compounds in which exactly one oxygen is bonded directly to the cyclopentanopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

553	Carbon bonded directly at the 17 beta-position of the cyclopentanohydrophenanthrene ring system is a member of an acyclic chain of three or four uninterruped carbons, (e.g., diketobisnorcholenic acids, etc.)
	This subclass is indented under subclass 502.  Compounds wherein carbon bonded directly at the 17 beta-position of the cyclopentanohydrophenanthrene ring system is a member of an acyclic chain of three or four uninterrupted carbons. (1) Note. Examples of compounds provided for herein are:

554	Halogen or nitrogen containing (e.g., 20-cyano-pregnanes, 21-cyano pregnenes, etc.)
	This subclass is indented under subclass 553.  Compounds which contain halogen or nitrogen. (1) Note. An example of a compound provided for herein is:

555	Exactly one oxygen bonded directly to the cyclopentanohydrophenanthrene ring system (e.g., 3-keto-bisnorcholenic acids, 3-keto-bisnor-cholene-22 als, etc.)
	This subclass is indented under subclass 553.  Compounds in which exactly one oxygen is bonded directly to the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

556	And oxygen bonded directly at the 20-position of the compound
	This subclass is indented under subclass 555.  Compounds wherein oxygen is bonded directly to the carbon at the 20-position of the acyclic carbon chain that is bonded directly at the 17-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

557	Carbon bonded directly at the 17-beta-position of the cyclopentanohydrophenanthrene ring system is a member of an acyclic chain of two uninterrupted carbons (e.g., pregnanes, etc.)
	This subclass is indented under subclass 502.  Compounds wherein carbon bonded directly at the 17 beta-position of the cyclopentanohydrophenanthrene ring system is a member of an acyclic chain of two uninterrupted carbons. (1) Note. An example of a compound provided for herein is:

558	The A ring is a benzene ring
	This subclass is indented under subclass 557.  Compounds in which the A ring of the cyclopentanohydrophenanthrene ring system contains three alternating double bonds (i.e., is a benzene ring). (1) Note. An example of a compound provided for herein is:

559	Three or more oxygens bonded directly to the cyclopentanohydrophenanthrene ring system
	This subclass is indented under subclass 557.  Compounds wherein three or more oxygens are bonded directly to the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

560	Oxygen bonded directly at the 1-, 2- or 4-position
	This subclass is indented under subclass 559.  Compounds wherein oxygen is bonded directly at the 1-, 2-, or 4-position of the cyclopentanohydrophenanthrene ring system.

561	Oxygen bonded directly at the 6-position
	This subclass is indented under subclass 559.  Compounds wherein oxygen is bonded directly at the 6-position of the cyclopentanohydrophenanthrene ring system.

562	Oxygen bonded directly at the 7-, 8- or 9-position
	This subclass is indented under subclass 559.  Compounds wherein oxygen is bonded directly at the 7-, 8-, or 9-position of the cyclopentanohydrophenanthrene ring system.

563	Oxygen bonded directly at the 14- or 15-position
	This subclass is indented under subclass 559.  Compounds wherein oxygen is bonded directly at the 14- or 15-position of the cyclopentanohydrophenanthrene ring system.

564	Oxygen bonded directly at the 16-position
	This subclass is indented under subclass 559.  Compounds wherein oxygen is bonded directly at the 16-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

565	Carbon or halogen bonded directly at the 6- or 7-position
	This subclass is indented under subclass 564.  Compounds wherein carbon or halogen is bonded directly at the 6- or 7-position of the cyclopentanohydrophenanthrene ring system.

566	Oxygen bonded directly at the 21-position (e.g., triamcinolone, etc.)
	This subclass is indented under subclass 564.  Compounds in which oxygen is bonded directly to the carbon at the 21-position of the acyclic carbon chain that is bonded directly at the 17-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

567	Halogen bonded directly at the 2- or 4-position (e.g., 4-bromocortisones, etc.)
	This subclass is indented under subclass 559.  Compounds wherein halogen is bonded directly at the 2- or 4- position of the cyclopentanohydrophenanthrene ring system.

568	The cyclopentanohydrophenanthrene ring system is fully saturated
	This subclass is indented under subclass 567.  Compounds wherein there are no double bonds between any ring members of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

569	Oxygen bonded directly at the 3-, 11-, and 17-positions
	This subclass is indented under subclass 559.  Compounds wherein oxygen is bonded directly at the 3-, 11-, and 17-positions of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

570	Oxygen bonded directly at the 21-position
	This subclass is indented under subclass 569.  Compounds in which oxygen is bonded directly to the carbon at the 21-position of the acyclic carbon chain that is bonded directly at the 17-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

571	Carbon bonded directly at the 1-, 2- or 4-position
	This subclass is indented under subclass 570.  Compounds wherein carbon is bonded directly at the 1-, 2-, or 4-position of the cyclopentanohydrophenanthrene ring system.

572	Carbon or halogen bonded directly at the 6- or 7-position
	This subclass is indented under subclass 570.  Compounds wherein carbon or halogen is bonded directly at the 6- or 7-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

573	Carbon bonded directly at the 16-position
	This subclass is indented under subclass 572.  Compounds wherein carbon is bonded directly at the 16-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

574	Carbon bonded directly at the 16-position (e.g., betamethasones, dexamethasones, etc.)
	This subclass is indented under subclass 570.  Compounds wherein carbon is bonded directly at the 16-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

575	Nitrogen or sulfur containing
	This subclass is indented under subclass 570.  Compounds which contain nitrogen or sulfur.

576	Unsaturation between the 1- and 2-positions and the 4- and 5-positions (e.g., prednisones, prednisolones, etc.)
	This subclass is indented under subclass 570.  Compounds which contain double bonds between the 1,2-positions and the 4,5-positions of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of compound provided for herein is:

577	Unsaturation between the 4- and 5-positions (e.g., cortisones, etc.)
	This subclass is indented under subclass 570.  Compounds which contain a double bond between the 4- and 5-positions of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

578	Additional unsaturation in the cyclopentanohydrophenanthrene ring system
	This subclass is indented under subclass 577.  Compounds which contain an additional double bond between ring members of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

579	The cyclopentanohydrophenanthrene ring system is fully saturated
	This subclass is indented under subclass 570.  Compounds wherein there are no double bonds between any ring members of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

580	Carbon or halogen bonded directly at the 6- or 7-position
	This subclass is indented under subclass 569.  Compounds wherein carbon or halogen is bonded directly at the 6- or 7-position of the cyclopentanohydrophenanthrene ring system.

581	Unsaturation between the 4- and 5-positions (e.g., 21-thiol prednisones, 21 thio cortisones, etc.)
	This subclass is indented under subclass 569.  Compounds which contain a double bond between the 4-and 5-positions of the cyclopentanohydrophenanthrene ring system. (1) Note. Examples of compounds provided for herein are:

582	Two oxygens bonded directly to the cyclopentanohydrophenanthrene ring system
	This subclass is indented under subclass 557.  Compounds wherein two oxygens are bonded directly to the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

583	Oxygen bonded directly at the 5-, 6- or 7-position
	This subclass is indented under subclass 582.  Compounds wherein oxygen is bonded directly at the 5-, 6-, or 7-position of the cyclopentanohydrophenanthrene ring system.

584	Oxygen bonded directly at the 12-position
	This subclass is indented under subclass 582.  Compounds wherein oxygen is bonded directly at the 12-position of the cyclopentanohydrophenanthrene ring system.

585	Oxygen bonded directly at the 15- or 16-position
	This subclass is indented under subclass 582.  Compounds wherein oxygen is bonded directly at the 15- or 16-position of the cyclopentanohydrophenanthrene ring system.

586	Oxygen bonded directly at the 3- and 11-position
	This subclass is indented under subclass 582.  Compounds wherein oxygen is bonded directly at the 3- and 11-positions of the cyclopentanohydrophenanthrene ring system.

587	Oxygen bonded directly at the 21-position
	This subclass is indented under subclass 586.  Compounds wherein oxygen is bonded directly to the carbon at the 21-position of the acyclic carbon chain that is bonded directly at the 17-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

588	Unsaturation between the 4- and 5-positions (e.g., aldosterones, corticosterones, etc.)
	This subclass is indented under subclass 587.  Compounds which contain a double between 4- and 5- positions of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

589	Carbon bonded directly at the 16-position
	This subclass is indented under subclass 586.  Compounds wherein carbon is bonded directly at the 16-position of the cyclopentanohydrophenanthrene ring system.

590	Unsaturation between the 4- and 5-positions
	This subclass is indented under subclass 586.  Compounds which contain a double bond between the 4- and 5-positions of the cyclopentanohydrophenanthrene ring system.

591	The cyclopentanohydrophenanthrene ring system is fully saturated
	This subclass is indented under subclass 586.  Compounds wherein there are no double bonds between any ring members of the cyclopentanohydrophenanthrene ring system.

592	Oxygen bonded directly at the 3- and 17-positions
	This subclass is indented under subclass 582.  Compounds wherein oxygen is bonded directly at the 3- and 17-positions of the cyclopentanohydrophenanthrene ring system.

593	Oxygen bonded directly at the 21-position
	This subclass is indented under subclass 592.  Compounds wherein oxygen is bonded directly to the carbon at the 21-position of the acyclic carbon chain that is bonded directly at the 17-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

594	Carbon or halogen bonded directly at the 6- or 7-position
	This subclass is indented under subclass 593.  Compounds wherein carbon or halogen is bonded directly at the 6- or 7-position of the cyclopentanohydrophenanthrene ring system.

595	Unsaturation between the 4- and 5-positions (e.g., 17-alpha-hydroxy progesterones, etc.)
	This subclass is indented under subclass 593.  Compounds which contain a double bond between the 4- and 5-positions of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

596	Carbon bonded directly at the 16-position
	This subclass is indented under subclass 592.  Compounds wherein carbon is bonded directly at the 16-position of the cyclopentanohydrophenanthrene ring system.

597	Carbon or halogen bonded directly at the 6- or 7-position
	This subclass is indented under subclass 592.  Compounds wherein carbon or halogen is bonded directly at the 6- or 7-position of the cyclopentanohydrophenanthrene ring system.

598	Unsaturation between the 4- and 5-positions
	This subclass is indented under subclass 592.  Compounds which contain a double bond between the 4- and 5- positions of the cyclopentanohydrophenanthrene ring system.

599	Exactly one oxygen bonded directly to the cyclopentanohydrophenanthrene ring system
	This subclass is indented under subclass 557.  Compounds wherein exactly one oxygen is bonded directly to the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

600	Oxygen bonded directly at the 21-position
	This subclass is indented under subclass 599.  Compounds wherein oxygen is bonded directly to the carbon at the 21-position of the acyclic carbon chain that is bonded directly at the 17-position of the cyclopentanohydrophenanthrene ring system.

601	Unsaturation between the 4- and 5-position (e.g., desoxycorticosterones, etc.)
	This subclass is indented under subclass 600.  Compounds which contain a double bond between the 4- and 5-positions of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

602	Additional unsaturation in the cyclopentanohydrophenanthrene ring system
	This subclass is indented under subclass 601.  Compounds which contain an additional double bond between ring members of the cyclopentanohydrophenanthrene ring system.

603	Carbon or halogen bonded directly at the 1-, 2-, 3-, 4- or 5-position
	This subclass is indented under subclass 599.  Compounds wherein carbon or halogen is bonded directly at the 1-,2-,3-,4-, or 5-position of the cyclopentanohydrophenanthrene ring system.

604	Carbon bonded directly at the 16-position (e.g., 16-cyanopregn-4-ene-3, 20 diones, etc.)
	This subclass is indented under subclass 599.  Compounds wherein carbon is bonded directly at the 16-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

605	Carbon or halogen bonded directly at the 6- or 7-position
	This subclass is indented under subclass 599.  Compounds wherein carbon or halogen is bonded directly at the 6- or 7-position of the cyclopentanohydrophenanthrene ring system.

606	Unsaturation between the 5- and 6-positions (e.g., pregnenolones, etc.)
	This subclass is indented under subclass 599.  Compounds which contain a double bond between the 5- and 6-positions of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

607	Unsaturation between the 4- and 5-positions (e.g., progesterones, etc.)
	This subclass is indented under subclass 599.  Compounds which contain a double bond between the 4- and 5-positions of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

608	Additional unsaturation in the cyclopentanohydrophenanthrene ring system
	This subclass is indented under subclass 607.  Compounds which contain an additional double bond between ring members of the cyclopentanohydrophenanthrene ring system.

609	The cyclopentanohydrophenanthrene ring system is fully saturated (e.g., pregnandiols, pregnanolones, etc.)
	This subclass is indented under subclass 599.  Compounds wherein there are no double bonds between any ring members of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

610	Acyclic carbon bonded directly at the 17 beta-position of the cyclopentanohydrophenanthrene ring system (e.g., etiocholanic acids, 17 cyanoetiocholanes, 17-aldehydrostanes, etc.)
	This subclass is indented under subclass 502.  Compounds wherein an acyclic carbon is bonded directly at the 17 beta-position of the cyclopentanohydrophenanthrene ring system. (1) Note. Examples of compounds provided for herein are:

611	Exactly one oxygen bonded directly to the cyclopentanohydrophenanthrene ring system (e.g., 3-keto-etiocholanic acids, etc.)
	This subclass is indented under subclass 610.  Compounds wherein exactly one oxygen is bonded directly to the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

612	Three or more oxygens bonded directly to the cyclopentanohydrophenanthrene ring system
	This subclass is indented under subclass 502.  Compounds wherein three or more oxygens are bonded directly to the cyclopentanohydrophenanthrene ring system. (1) Note. Examples of compounds provided for herein are:

613	Oxygen bonded directly at the 1-position
	This subclass is indented under subclass 612.  Compounds wherein oxygen is bonded directly at the 1-position of the cyclopentanohydrophenanthrene ring system.

614	Oxygen bonded directly at the 2- or 4-position
	This subclass is indented under subclass 612.  Compounds wherein oxygen is bonded directly at the 2- or 4-position of the cyclopentanohydrophenanthrene ring system.

615	Oxygen bonded directly at the 5-, 6- or 7-position
	This subclass is indented under subclass 612.  Compounds wherein oxygen is bonded directly at the 5-,6- or 7-position of the cyclopentanohydrophenanthrene ring system.

616	Oxygen bonded directly at the 16-position
	This subclass is indented under subclass 612.  Compounds wherein oxygen is bonded directly at the 16-position of the cyclopentanohydrophenanthrene ring system.

617	The A ring is a benzene ring (e.g., estriols, etc.)
	This subclass is indented under subclass 616.  Compounds in which the A ring of the cyclopentanohydrophenanthrene ring system contains three alternating double bonds (i.e., is a benzene ring). (1) Note. An example of a compound provided for herein is:

618	The A ring is a benzene ring
	This subclass is indented under subclass 612.  Compounds in which the A ring of the cyclopentanohydrophenanthrene ring system contains three alternating double bonds (i.e., is a benzene ring).

619	Oxygen bonded directly at the 3-, 11- and 17-positions (e.g., 1-androstene 3,11,17-triones, etc.)
	This subclass is indented under subclass 612.  Compounds wherein oxygen is bonded directly at the 3-, 11- and 17-positions of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

620	Carbon or halogen bonded directly at the 1, 2- or 4-position
	This subclass is indented under subclass 619.  Compounds wherein carbon or halogen is bonded directly at the 1-,2-, or 4-position of the cyclopentanohydrophenanthrene ring system.

621	Unsaturation between the 4- and 5-positions (e.g., adrenosterones, 11 hydroxytestosterones, etc.)
	This subclass is indented under subclass 619.  Compounds which contain a double bond between the 4- and 5-positions of the cyclopentanohydrophenanthrene ring system. (1) Note. Examples of compounds provided for herein are:

622	17 alpha-position substituted (e.g., 11-keto-17 alpha-alkyltestosterones, etc.)
	This subclass is indented under subclass 621.  Compounds in which a substituent is bonded directly at the 17 alpha-position of the cyclopentanohydrophenanthrene ring system. (1) Note. Examples of compounds provided for herein are:

623	Two oxygens bonded directly to the cyclopentanohydrophenanthrene ring system
	This subclass is indented under subclass 502.  Compounds wherein two oxygens are bonded directly to the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

624	Oxygen bonded directly at the 16-position
	This subclass is indented under subclass 623.  Compounds wherein oxygen is bonded directly at the 16-position of the cyclopentanohydrophenanthrene ring system.

625	The A ring is a benzene ring (e.g., estrones, estradiols, etc.)
	This subclass is indented under subclass 623.  Compounds in which the A ring of the cyclopentanohydrophenanthrene ring system contains three alternating double bonds (i.e., is a benzene ring). (1) Note. An example of a compound provided for herein is:

626	Nitrogen or sulfur containing
	This subclass is indented under subclass 625.  Compounds which contain nitrogen or sulfur.

627	Carbon or halogen bonded directly at the 1-, 2- or 4-position
	This subclass is indented under subclass 625.  Compounds wherein carbon or halogen is bonded directly at the 1-, 2-, or 4-position of the cyclopentanohydrophenanthrene ring system.

628	Carbon or halogen bonded directly at the 6- or 7-position
	This subclass is indented under subclass 625.  Compounds wherein carbon or halogen is bonded directly at the 6- or 7-position of the cyclopentanohydrophenanthrene ring system.

629	Carbon bonded directly at the 11-, 15- or 16-position
	This subclass is indented under subclass 625.  Compounds wherein carbon is bonded directly at the 11-, 15-, or 16-position of the cyclopentanohydrophenanthrene ring system.

630	17 alpha-position substituted
	This subclass is indented under subclass 625.  Compounds in which a substituent is bonded directly at the 17 alpha-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

631	The 17 alpha-position substituent contains acyclic carbon-to-carbon unsaturation
	This subclass is indented under subclass 630.  Compounds in which the substituent bonded directly at the 17 alpha-position contains acyclic carbon-to-carbon unsaturation. (1) Note. Examples of compounds provided for herein are:

632	19-position substituted (e.g., 19-methylene-androstanes, 10-cyanoestranes, etc.)
	This subclass is indented under subclass 623.  Compounds in which a substituent is bonded directly at the 19-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is: (2) Note. The 19-position is present in the cyclopentanohydrophenanthrene ring system when a carbon is bonded directly at the 10-position of the cyclopentanohydrophenanthrene ring system, said carbon being designated the 19-position.

633	Carbon bonded directly at the 10- and 13-positions (e.g., androstenes, etc.)
	This subclass is indented under subclass 623.  Compounds wherein carbon is bonded directly at the 10- and 13-positions of the cyclopentanohydrophenanthrene ring system. (1) Note. Examples of compounds provided for herein are:

634	Carbon or halogen bonded directly at the 1- or 3-position
	This subclass is indented under subclass 633.  Compounds wherein carbon or halogen is bonded directly at the 1- or 3-position of the cyclopentanohydrophenanthrene ring system.

635	Carbon or halogen bonded directly at the 2- or 4-position
	This subclass is indented under subclass 633.  Compounds wherein carbon or halogen is bonded directly at the 2- or 4-position of the cyclopentanohydrophenanthrene ring system.

636	Unsaturation between the 5- and 6-positions (e.g., dehydroandrosterones, etc.)
	This subclass is indented under subclass 633.  Compounds which contain a double bond between the 5- and 6-positions of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

637	17 alpha-position substituted (e.g., 17 alpha-ethynyl-5-androstene-3 beta, 17 beta-diols, etc.)
	This subclass is indented under subclass 636.  Compounds in which a substituent is bonded directly at the 17 alpha-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

638	Unsaturation between the 4- and 5-positions (e.g., testosterones, etc.)
	This subclass is indented under subclass 633.  Compounds which contain a double bond between the 4- and 5-positions of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

639	17 alpha-position substituted (e.g., 17 alpha-alkynylandrosta-4, 6-diene 3,17-diols, etc.)
	This subclass is indented under subclass 638.  Compounds in which a substituent is bonded directly at the 17 alpha-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

640	Additional unsaturation in the cyclopentanohydrophenanthrene ring system
	This subclass is indented under subclass 638.  Compounds which contain an additional double bond between ring members of the cyclopentanohydrophenanthrene ring system.

641	The cyclopentanohydrophenanthrene ring system is fully saturated (e.g., androstandiols, androsterones, dihydrotestosterones, etc.)
	This subclass is indented under subclass 633.  Compounds wherein there are no double bonds between any ring members of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

642	Carbon bonded directly at the 13-position (e.g., 19-norandrostenes, estradienes, etc.)
	This subclass is indented under subclass 623.  Compounds wherein carbon is bonded directly at the 13-position of the cyclopentanohydrophenanthrene ring system. (1) Note. Examples of compounds provided for herein are:

643	Carbon or halogen bonded directly at the 1-, 2-, 4- or 5-position
	This subclass is indented under subclass 642.  Compounds wherein carbon or halogen is bonded directly at the 1-, 2-, 4-, or 5-position of the cyclopentanohydrophenanthrene ring system.

644	Unsaturation between the 5- and 10-positions
	This subclass is indented under subclass 642.  Compounds which contain a double bond between the 5- and 10-positions of the cyclopentanohydrophenanthrene ring system.

645	17 alpha-position substituted (e.g., 17 alpha-ethynyl-17-hydroxy-5(10) estren-3-ones, etc.)
	This subclass is indented under subclass 644.  Compounds in which a substituent is bonded directly at the 17 alpha-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

646	Unsaturation between the 4- and 5-positions (e.g., 19-nortestosterones, 13 beta-alkyl-4-gonene-3,17-diones etc.)
	This subclass is indented under subclass 642.  Compounds which contain a double bond between the 4- and 5-positions of the cyclopentanohydrophenanthrene ring system. (1) Note. Examples of compounds provided for herein are:

647	Carbon or halogen bonded directly at the 6- or 7-position
	This subclass is indented under subclass 646.  Compounds wherein carbon or halogen is bonded directly at the 6- or 7-position of the cyclopentanohydrophenanthrene ring system.

648	17 alpha-position substituted (e.g., 17 alpha-ethynyl-19 nortestosterones, etc.)
	This subclass is indented under subclass 646.  Compounds in which a substituent is bonded directly at the 17 alpha-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

649	The cyclopentanohydrophenanthrene ring system is fully saturated (e.g., 17 alpha-alkyl-17 beta-hydroxyestran-3-ones, etc.)
	This subclass is indented under subclass 642.  Compounds wherein there are no double bonds between any ring members of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

650	Oxygen bonded directly at the 16- or 17-position of the cyclopentanohydrophenanthrene ring system
	This subclass is indented under subclass 502.  Compounds wherein oxygen is bonded directly at the 16- or 17-position of the cyclopentanohydrophenanthrene ring system. (1) Note. An example of a compound provided for herein is:

651	Carbon or halogen bonded directly at the 1- or 3-position
	This subclass is indented under subclass 650.  Compounds wherein carbon or halogen is bonded directly at the 1- or 3-position of the cyclopentanohydrophenanthrene ring system.

652	Carbon or halogen bonded directly at the 2-, 4- or 5-position
	This subclass is indented under subclass 650.  Compounds wherein carbon or halogen is bonded directly at the 2-, 4-, or 5-position of the cyclopentanohydrophenanthrene ring system.

653	9,10-Seco-cyclopentanohydrophenanthrene ring system or 9,10-seco cyclopentanohydrophenanthrene ring system having a bond between the 3- and 5-positions (e.g., vitamin D compounds, cholecalciferols, activated 7-dehydrocholesterols, dihydrotachysterols, 3,5 cyclovitamin D compounds, etc.)
	This subclass is indented under subclass 350.  Compounds under Class 260, ... , which have the following basic structures: (1) Note. Examples of compounds provided for herein are: