| 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} |
| 452 | DF | .~.~.~.~ Bicyclo ring system having the five-membered hetero ring as one of the cyclos (e.g., octahydroindoles, etc.) {7} |
| 454 | DF | .~.~.~.~.~ Additional polycyclo heterocyclic ring system attached directly or indirectly to the bicyclo ring system by nonionic bonding {3} |
| 455 | DF | .~.~.~.~.~.~ The additional polycyclo ring system includes a five-membered nitrogen containing hetero ring {3} |
| 460 | DF | .~.~.~.~.~.~.~ Ring carbon of each of the two five-membered hetero rings is bonded directly to chalcogen or nitrogen (e.g., both rings may be bonded to the same nitrogen atom or to different nitrogen atoms, etc.) {1} |
| 461 | DF | .~.~.~.~.~.~.~.~ Plural chalcogens bonded directly to ring carbons of each of the two five membered hetero rings (e.g., bisphthalimides, etc.) {1} |
| 462 |  | .~.~.~.~.~.~.~.~.~ The ring nitrogen of each of the two five-membered hetero rings is bonded directly to the same atom or chain, which chain may include a ring (e.g., N,N'-ethylene-bisphthalimide, etc.) |