| 546 / | 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) {1} |
| 1 | DF | .~.~ Hetero ring is six-membered consisting of one nitrogen and five carbons {24} |
| 339 | DF | .~.~.~ Chalcogen attached indirectly to the six-membered hetero ring by nonionic bonding (e.g., sulfato betaines, etc.) {3} |
| 340 | DF | .~.~.~.~ The chalcogen, X, is in a -C(=X)- group {1} |
| 341 | DF | .~.~.~.~.~ The -C(=X)- is part of a -C(=X)X- group, wherein the X's are the same of diverse chalcogens {1} |
| 342 |  | .~.~.~.~.~.~ Additional ring containing |