| 549 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
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| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {1} |
| * | DD | .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {2} |
| 1 | DF | .~.~ Sulfur containing hetero ring (e.g., thiiranes, etc.) {9} |
| 29 | DF | .~.~.~ The hetero ring is five-membered {13} |
| 74 | DF | .~.~.~.~ Nitrogen attached indirectly to the hetero ring by nonionic bonding {1} |
| 75 | DF | .~.~.~.~.~ Chalcogen attached indirectly to the hetero ring by nonionic bonding {1} |
| 76 | DF | .~.~.~.~.~.~ The chalcogen, X, is in a -C(=X)- group {1} |
| 77 |  | .~.~.~.~.~.~.~ Unsaturated carbocyclic ring or acyclic carbon to carbon unsaturation containing |