| 544 / | 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) {1} |
| 1 | DF | .~.~ Hetero ring is six-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazines, etc.) {6} |
| 224 | DF | .~.~.~ The six-membered hetero ring consists of two nitrogens and four carbons (e.g., 1,2-diazines, etc.) {9} |
| 336 | DF | .~.~.~.~ 1,4-diazines {9} |
| 358 | DF | .~.~.~.~.~ Piperazines (i.e., fully hydrogenated 1,4-diazines) {12} |
| 359 | DF | .~.~.~.~.~.~ Additional hetero ring containing {4} |
| 372 | DF | .~.~.~.~.~.~.~ Five-membered hetero ring consisting of one nitrogen and four carbons {1} |
| 373 |  | .~.~.~.~.~.~.~.~ The five-membered hetero ring is one of the cyclos in a bicyclo ring system |