| 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 |  | .~.~.~ Polycyclo ring system having the six-membered hetero ring as one of the cyclos {4} |
| 280 | DF | .~.~.~.~> Pentacyclo ring system having the six-membered hetero ring as one of the cyclos {2} |
| 284 | DF | .~.~.~.~> Tetracyclo ring system having the six-membered hetero ring as one of the cyclos {2} |
| 290 | DF | .~.~.~.~> Tricyclo ring system having the six-membered hetero ring as one of the cyclos {6} |
| 299 | DF | .~.~.~.~> Bicyclo ring system having the six-membered hetero ring as one of the cyclos {6} |