| 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 | DF | .~.~.~.~ Tricyclo ring system having the six-membered hetero ring as one of the cyclos {7} |
| 101 | DF | .~.~.~.~.~ Each of the three cyclos is six-membered (e.g., benzoquinolines, etc.) {3} |
| 108 |  | .~.~.~.~.~.~ Phenanthridines (including hydrogenated) {1} |
| 109 | DF | .~.~.~.~.~.~.~> Unsaturated ring bonded directly to ring carbon of the six-membered hetero ring |