| 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} |
| 356.1 | DF | .~.~.~ 1,2-diazoles (including hydrogenated) {8} |
| 364.1 | DF | .~.~.~.~ Additional hetero ring attached directly or indirectly to the diazole ring by nonionic bonding {3} |
| 364.4 |  | .~.~.~.~.~ The additional hetero ring is a cyclo in a polycyclo ring system {1} |
| 364.7 | DF | .~.~.~.~.~.~> The polycyclo ring system contains nitrogen as the only ring hetero atom |