| 546 / | 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 consisting of one nitrogen and five carbons {24} |
| 314 | DF | .~.~.~ Carbonyl bonded directly to the six-membered hetero ring {4} |
| 315 |  | .~.~.~.~ At 3-position {2} |
| 316 | DF | .~.~.~.~.~> Acyclic nitrogen bonded directly to the carbonyl {1} |
| 318 | DF | .~.~.~.~.~> The carbonyl is in a -COO- group {3} |