| 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} |
| 83 | DF | .~.~.~.~ The compound consists of the ring sulfur, carbon, and hydrogen {2} |
| 84 | DF | .~.~.~.~.~ Process of forming the hetero ring from acyclic reactants only {1} |
| 85 |  | .~.~.~.~.~.~ Metal containing catalyst utilized |