| 552 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
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| * | DD | ORGANIC COMPOUNDS (Class 532, subclass 1) {11} |
| 502 | DF | .~ Cyclopentanohydrophenanthrene ring system containing {21} |
| 557 | DF | .~.~ 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.) {4} |
| 599 | DF | .~.~.~ Exactly one oxygen bonded directly to the cyclopentanohydrophenanthrene ring system {7} |
| 600 | DF | .~.~.~.~ Oxygen bonded directly at the 21-position {1} |
| 601 | DF | .~.~.~.~.~ Unsaturation between the 4- and 5-position (e.g., desoxycorticosterones, etc.) {1} |
| 602 |  | .~.~.~.~.~.~ Additional unsaturation in the cyclopentanohydrophenanthrene ring system |