| 552 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
| * | DD | ORGANIC COMPOUNDS (Class 532, subclass 1) {11} |
| 502 | DF | .~ Cyclopentanohydrophenanthrene ring system containing {21} |
| 536 | | .~.~ Halogen bonded directly at the 16-position of the cyclopentanohydrophenanthrene ring system {2} |
| 537 | DF | .~.~.~> Plural halogens bonded directly at the 16-position |
| 538 | DF | .~.~.~> Carbon bonded directly at the 17 beta-position is a member of an acyclic chain of two or more uninterrupted carbons |