| 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} |
| 592 | DF | .~.~.~.~ Oxygen bonded directly at the 3- and 17-positions {4} |
| 593 |  | .~.~.~.~.~ Oxygen bonded directly at the 21-position {2} |
| 594 | DF | .~.~.~.~.~.~> Carbon or halogen bonded directly at the 6- or 7-position |
| 595 | DF | .~.~.~.~.~.~> Unsaturation between the 4- and 5-positions (e.g., 17-alpha-hydroxy progesterones, etc.) |