| 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 |  | .~.~.~.~ Tricyclo ring system having the five-membered hetero ring as one of the cyclos {6} |
| 428 | DF | .~.~.~.~.~> Ring nitrogen is shared by two of the cyclos |
| 429 | DF | .~.~.~.~.~> Plural ring hetero atoms in the tricyclo ring system {2} |
| 434 | DF | .~.~.~.~.~> Two of the cyclos share at least three ring members (i.e., bridged) {1} |
| 436 | DF | .~.~.~.~.~> A ring carbon is shared by three of the cyclos (e.g., peri-fused, etc.) {2} |
| 439 | DF | .~.~.~.~.~> The five-membered hetero ring shares ring carbons with two carbocyclic rings (e.g., tetrahydrocarbazoles, etc.) {3} |
| 450 | DF | .~.~.~.~.~> Chalcogen bonded directly to ring carbon of the five-membered hetero ring (e.g., indigoid dyes, etc.) {1} |