| 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 |  | .~.~.~ Exactly one oxygen bonded directly to the cyclopentanohydrophenanthrene ring system {7} |
| 600 | DF | .~.~.~.~> Oxygen bonded directly at the 21-position {1} |
| 603 | DF | .~.~.~.~> Carbon or halogen bonded directly at the 1-, 2-, 3-, 4- or 5-position |
| 604 | DF | .~.~.~.~> Carbon bonded directly at the 16-position (e.g., 16-cyanopregn-4-ene-3, 20 diones, etc.) |
| 605 | DF | .~.~.~.~> Carbon or halogen bonded directly at the 6- or 7-position |
| 606 | DF | .~.~.~.~> Unsaturation between the 5- and 6-positions (e.g., pregnenolones, etc.) |
| 607 | DF | .~.~.~.~> Unsaturation between the 4- and 5-positions (e.g., progesterones, etc.) {1} |
| 609 | DF | .~.~.~.~> The cyclopentanohydrophenanthrene ring system is fully saturated (e.g., pregnandiols, pregnanolones, etc.) |