| 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} |
| 268.1 | DF | .~.~.~ Additional hetero ring containing {4} |
| 276.4 |  | .~.~.~.~ The additional hetero ring is five-membered consisting of one nitrogen and four carbons {4} |
| 276.7 | DF | .~.~.~.~.~> Polycyclo ring system having the five-membered hetero ring as one of the cyclos {2} |
| 278.4 | DF | .~.~.~.~.~> Chalcogen attached directly to the five-membered hetero ring by nonionic bonding {1} |
| 279.1 | DF | .~.~.~.~.~> Nitrogen or -C(=X)-, wherein X is chalcogen, attached directly to the five- membered ring by nonionic bonding |
| 279.4 | DF | .~.~.~.~.~> Nicotine, per se, or its salts |