| 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} |
| 559 | DF | .~.~.~ Three or more oxygens bonded directly to the cyclopentanohydrophenanthrene ring system {7} |
| 569 |  | .~.~.~.~ Oxygen bonded directly at the 3-, 11-, and 17-positions {3} |
| 570 | DF | .~.~.~.~.~> Oxygen bonded directly at the 21-position {7} |
| 580 | DF | .~.~.~.~.~> Carbon or halogen bonded directly at the 6- or 7-position |
| 581 | DF | .~.~.~.~.~> Unsaturation between the 4- and 5-positions (e.g., 21-thiol prednisones, 21 thio cortisones, etc.) |