| 546 / | 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) {1} |
| 1 | DF | .~.~ Hetero ring is six-membered consisting of one nitrogen and five carbons {24} |
| 26 | DF | .~.~.~ Polycyclo ring system having the six-membered hetero ring as one of the cyclos {9} |
| 79 |  | .~.~.~.~ Tricyclo ring system having the six-membered hetero ring as one of the cyclos {7} |
| 80 | DF | .~.~.~.~.~> Plural ring hetero atoms in the tricyclo ring system {2} |
| 93 | DF | .~.~.~.~.~> One of the cyclos has at least seven members |
| 94 | DF | .~.~.~.~.~> Ring nitrogen is shared by two of the cyclos {1} |
| 97 | DF | .~.~.~.~.~> Two of the cyclos share at least three ring carbons (e.g., benzomorphans, etc.) |
| 98 | DF | .~.~.~.~.~> Ring carbon is shared by each of the three cyclos (e.g., 1,8 naphthalimides, etc.) {1} |
| 101 | DF | .~.~.~.~.~> Each of the three cyclos is six-membered (e.g., benzoquinolines, etc.) {3} |
| 111 | DF | .~.~.~.~.~> The tricyclo ring system consists of a five-membered carbocyclic ring ortho fused to both a six-membered carbocyclic ring and the six-membered hetero ring (e.g., indenopyridines, etc.) |