| 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} |
| 180 | DF | .~.~.~ Triazines {11} |
| 194 | DF | .~.~.~.~ Substituent nitrogen bonded directly to carbon of the triazine ring {5} |
| 196 | DF | .~.~.~.~.~ Three substituent nitrogens bonded directly to the three carbons of the triazine ring {3} |
| 200 | DF | .~.~.~.~.~.~ Melamine per se, or salt thereof {3} |
| 203 |  | .~.~.~.~.~.~.~ Purification or recovery |