| 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} |
| 146 | DF | .~.~.~ 1,3-thiazoles (including hydrogenated) {7} |
| 202 | DF | .~.~.~.~ Plural double bonds between ring members of thiazole ring {1} |
| 203 | DF | .~.~.~.~.~ Chalcogen attached indirectly to the thiazole ring by nonionic bonding {2} |
| 204 |  | .~.~.~.~.~.~ The chalcogen, X, is in a -C(=X)- group |