| 540 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
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| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {1} |
| 1 | DF | .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS {6} |
| 2 | DF | .~.~ Cyclopentanohydrophenanthrene ring system containing {10} |
| 47 | DF | .~.~.~ The cyclopentanohydrophenanthrene ring system is part of a polycyclo ring system having at least five cyclos {1} |
| 48 | DF | .~.~.~.~ Hetero ring is one of the cyclos of the polycyclo ring system {8} |
| 76 |  | .~.~.~.~.~ The hetero ring is three-membered consisting of one oxygen and two carbons (e.g., oxirane, etc.) {9} |
| 77 | DF | .~.~.~.~.~.~> The polycyclo ring system contains plural oxirane rings |
| 78 | DF | .~.~.~.~.~.~> The hetero ring shares the 1,2-positions of the cyclopentanohydrophenanthrene ring system |
| 79 | DF | .~.~.~.~.~.~> The hetero ring shares the 4,5-positions of the cyclopentanohydrophenanthrene ring system |
| 80 | DF | .~.~.~.~.~.~> The hetero ring shares the 5,6-positions of the cyclopentanohydrophenanthrene ring system |
| 81 | DF | .~.~.~.~.~.~> The hetero ring shares the 6,7-positions of the cyclopentanohydrophenanthrene ring system |
| 82 | DF | .~.~.~.~.~.~> The hetero ring shares the 11,12-positions of the cyclopentanohydrophenanthrene ring system |
| 83 | DF | .~.~.~.~.~.~> The hetero ring shares the 14,15-positions of the cyclopentanohydrophenanthrene ring system |
| 84 | DF | .~.~.~.~.~.~> The hetero ring shares the 16,17-positions of the cyclopentanohydrophenanthrene ring system {2} |
| 87 | DF | .~.~.~.~.~.~> The hetero ring shares the 9,11-positions of the cyclopentanohydrophenanthrene ring system {2} |