| 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} |
| 316.4 |  | .~.~.~.~ Chalcogen bonded directly to ring carbon of the diazole ring (e.g., N-vinyl-N, N'ethylene urea, etc.) {9} |
| 316.7 | DF | .~.~.~.~.~> Additional chalcogen attached directly to ring nitrogen of the diazole ring by nonionic bonding |
| 317.1 | DF | .~.~.~.~.~> Plural chalcogens bonded directly to ring carbons of the diazole ring {7} |
| 321.5 | DF | .~.~.~.~.~> Nitrogen attached directly to the diazole ring by nonionic bonding {1} |
| 322.5 | DF | .~.~.~.~.~> Having -C(=X)-, wherein X is chalcogen, bonded directly to the diazole ring {1} |
| 323.5 | DF | .~.~.~.~.~> Chalcogen attached indirectly to the diazole ring by acyclic nonionic bonding {1} |
| 324.5 | DF | .~.~.~.~.~> Nitrogen attached indirectly to the diazole ring by acyclic nonionic bonding |
| 325.1 | DF | .~.~.~.~.~> The chalcogen is sulfur or selenium (e.g., 2-mercaptoimidazoline, ethylenethiourea, etc.) |
| 325.5 | DF | .~.~.~.~.~> Benzene ring bonded directly to the diazole ring |
| 326.1 | DF | .~.~.~.~.~> The diazole ring is further unsubstituted (e.g., cyclic ethylene urea, etc.) |