| 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} |
| 347.1 | DF | .~.~.~.~ One double bond between ring members of the diazole ring (i.e., imidazoline) {4} |
| 350.1 | DF | .~.~.~.~.~ Chalcogen attached indirectly to the diazole ring by acyclic nonionic bonding (e.g., hydroxyalkyl glyoxalidine, etc.) {3} |
| 351.1 |  | .~.~.~.~.~.~ The chalcogen is sulfur |