| 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} |
| 338 | DF | .~.~.~.~.~ Polycyclo ring system having the diazine ring as one of the cyclos {5} |
| 349 | DF | .~.~.~.~.~.~ Bicyclo ring system having the diazine ring as one of the cyclos {3} |
| 353 |  | .~.~.~.~.~.~.~ Quinoxalines (including hydrogenated) {3} |
| 354 | DF | .~.~.~.~.~.~.~>.~ Chalcogen bonded directly to diazine ring carbon |
| 355 | DF | .~.~.~.~.~.~.~>.~ Having -C(=X)-, wherein X is chalcogen, bonded directly to diazine ring carbon |
| 356 | DF | .~.~.~.~.~.~.~>.~ Halogen or nitrogen attached directly to diazine ring carbon by nonionic bonding |