| 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 |  | .~.~.~ Polycyclo ring system having the six-membered hetero ring as one of the cyclos {9} |
| 27 | DF | .~.~.~.~> The polycyclo ring system has at least ten cyclos and at least four ring nitrogens |
| 28 | DF | .~.~.~.~> Nonacyclo ring system having the six-membered hetero ring as one of the cyclos {1} |
| 30 | DF | .~.~.~.~> Octacyclo ring system having the six-membered hetero ring as one of the cyclos {1} |
| 33 | DF | .~.~.~.~> Heptacyclo ring system having the six-membered hetero ring as one of the cyclos {2} |
| 38 | DF | .~.~.~.~> Hexacyclo ring system having the six-membered hetero ring as one of the cyclos {2} |
| 42 | DF | .~.~.~.~> Pentacyclo ring system having the six-membered hetero ring as one of the cyclos {3} |
| 61 | DF | .~.~.~.~> Tetracyclo ring system having the six-membered hetero ring as one of the cyclos {5} |
| 79 | DF | .~.~.~.~> Tricyclo ring system having the six-membered hetero ring as one of the cyclos {7} |
| 112 | DF | .~.~.~.~> Bicyclo ring system having the six-membered hetero ring as one of the cyclos {7} |