| 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} |
| 300.1 | DF | .~.~.~ 1,3-diazoles (including hydrogenated) {9} |
| 335.1 | DF | .~.~.~.~ Two double bonds between ring members of the diazole ring (i.e., imidazole) {7} |
| 335.5 | DF | .~.~.~.~.~ Nitrogen attached indirectly to the diazole ring by acyclic nonionic bonding {4} |
| 338.1 | DF | .~.~.~.~.~.~ Having -C(=X)-, wherein X is chalcogen, bonded directly to the nitrogen {1} |
| 338.5 |  | .~.~.~.~.~.~.~ The chalcogen is sulfur or sulfur attached indirectly to the -C(=X)- group by acyclic nonionic bonding |