| 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 |  | .~.~.~.~ Bicyclo ring system having the five-membered hetero ring as one of the cyclos (e.g., octahydroindoles, etc.) {7} |
| 453 | DF | .~.~.~.~.~> Plural ring hetero atoms in the bicyclo ring system, or ring nitrogen is shared by the two cyclos of the bicyclo ring system |
| 454 | DF | .~.~.~.~.~> Additional polycyclo heterocyclic ring system attached directly or indirectly to the bicyclo ring system by nonionic bonding {3} |
| 465 | DF | .~.~.~.~.~> Additional hetero ring, attached directly or indirectly to the bicyclo ring system by nonionic bonding {2} |
| 469 | DF | .~.~.~.~.~> The bicyclo ring system consists of the five-membered hetero ring and a benzene ring (e.g., indole, etc.) {10} |
| 512 | DF | .~.~.~.~.~> Chalcogen bonded directly to ring carbon of the five-membered hetero ring (e.g., adrenochrome, etc.) {1} |
| 515 | DF | .~.~.~.~.~> The ring nitrogen is bonded directly to two ring carbons of the same cyclo which carbons are members of one cyclo only (e.g., cyclopenta(c)pyrroles, etc.) |
| 516 | DF | .~.~.~.~.~> Two double bonds between ring members of the five-membered hetero ring (e.g., 4,5,6,7-tetrahydroindoles, etc.) |