| 548 / | 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) {4} |
| 100 | DF | .~.~ Hetero ring is five-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazoles, etc.) {18} |
| 262.2 | DF | .~.~.~ 1,2,4-triazoles (including hydrogenated) {13} |
| 267.8 |  | .~.~.~.~ Chalcogen attached indirectly to the triaole ring by acyclic nonionic bonding {3} |
| 268.2 | DF | .~.~.~.~.~> The triazole ring and the chalcogen are bonded directly to the same acyclic carbon |
| 268.4 | DF | .~.~.~.~.~> Acyclic carbon bonded directly to triazole ring nitrogen is multiple bonded to an additional carbon |
| 268.6 | DF | .~.~.~.~.~> Plural chalcogens attached indirectly to the triazole ring by acyclic nonionic bonding |