| 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} |
| 416 | DF | .~.~.~ Polycyclo ring system having the five-membered hetero ring as one of the cyclos {5} |
| 427 | DF | .~.~.~.~ Tricyclo ring system having the five-membered hetero ring as one of the cyclos {6} |
| 439 | DF | .~.~.~.~.~ The five-membered hetero ring shares ring carbons with two carbocyclic rings (e.g., tetrahydrocarbazoles, etc.) {3} |
| 440 | DF | .~.~.~.~.~.~ The five-membered hetero ring shares ring carbons with two benzene rings (i.e., carbazoles) {5} |
| 445 | DF | .~.~.~.~.~.~.~ The tricyclo ring system is unsubstituted or is hydrocarbyl substituted only (e.g., N-vinyl carbazole, etc.) {1} |
| 446 |  | .~.~.~.~.~.~.~.~ Carbazole per se or alkyl substituted only {1} |
| 447 | DF | .~.~.~.~.~.~.~>.~.~ Processes of forming by cyclization or alkylation |