| 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 | DF | .~.~.~.~ At 3-position {2} |
| 318 |  | .~.~.~.~.~ The carbonyl is in a -COO- group {3} |
| 319 | DF | .~.~.~.~.~.~> Processes of obtaining nicotinic acid per se or a derivative of nicotinic acid wherein the only substituents are -COO- groups, or salt thereof {1} |
| 321 | DF | .~.~.~.~.~.~> Additional -COO- group bonded directly to the six-membered hetero ring |
| 322 | DF | .~.~.~.~.~.~> Carbocyclic ring containing |