| 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} |
| 61 |  | .~.~.~.~ Tetracyclo ring system having the six-membered hetero ring as one of the cyclos {5} |
| 62 | DF | .~.~.~.~.~> Plural ring hetero atoms in the tetracyclo ring system (e.g., acronycines, etc.) {4} |
| 71 | DF | .~.~.~.~.~> Ring nitrogen is shared by two of the cyclos {2} |
| 74 | DF | .~.~.~.~.~> Two of the cyclos share at least three ring members (e.g., morphinans, etc.) |
| 75 | DF | .~.~.~.~.~> Ring carbon is shared by three of the cyclos {1} |
| 77 | DF | .~.~.~.~.~> The six-membered hetero ring shares ring members with one other cyclo only {1} |