| 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} |
| 582 | DF | .~.~.~ Two oxygens bonded directly to the cyclopentanohydrophenanthrene ring system {5} |
| 586 |  | .~.~.~.~ Oxygen bonded directly at the 3- and 11-position {4} |
| 587 | DF | .~.~.~.~.~> Oxygen bonded directly at the 21-position {1} |
| 589 | DF | .~.~.~.~.~> Carbon bonded directly at the 16-position |
| 590 | DF | .~.~.~.~.~> Unsaturation between the 4- and 5-positions |
| 591 | DF | .~.~.~.~.~> The cyclopentanohydrophenanthrene ring system is fully saturated |