| 548 / | 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) {4} |
| 400 | DF | .~.~ Hetero ring is five-membered consisting of one nitrogen and four carbons (e.g., halopyrrolidines, etc.) {20} |
| 560 |  | .~.~.~ Two double bonds between ring members of the five-membered hetero ring {4} |
| 561 | DF | .~.~.~.~> Nitrogen attached indirectly to the five-membered hetero ring by acyclic nonionic bonding |
| 562 | DF | .~.~.~.~> Chalcogen attached indirectly to the five-membered hetero ring by acyclic nonionic bonding |
| 563 | DF | .~.~.~.~> Benzene ring bonded directly to ring nitrogen of the five -membered hetero ring |
| 564 | DF | .~.~.~.~> The five-membered hetero ring is unsubstituted or alkyl substituted only (e.g., pyrrole, etc.) |