| 514 / | HD | DRUG, BIO-AFFECTING AND BODY TREATING COMPOSITIONS |
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| 1 | DF | DESIGNATED ORGANIC ACTIVE INGREDIENT CONTAINING (DOAI) {29} |
| 183 | DF | .~ Heterocyclic carbon compounds containing a hetero ring having chalcogen (i.e., O,S,Se or Te) or nitrogen as the only ring hetero atoms DOAI {16} |
| 277 | DF | .~.~ Hetero ring is six-membered consisting of one nitrogen and five carbon atoms {11} |
| 279 | DF | .~.~.~ Polycyclo ring system having the six-membered hetero ring as one of the cyclos {4} |
| 280 |  | .~.~.~.~ Pentacyclo ring system having the six-membered hetero ring as one of the cyclos {2} |
| 281 | DF | .~.~.~.~.~> Two of the cyclos share at least three ring members (i.e., bridged) {1} |
| 283 | DF | .~.~.~.~.~> Ring nitrogen in the pentacyclo ring system is shared by five-membered cyclo and six-membered cyclo (e.g., vincamine, etc.) |