| 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} |
| 247 | DF | .~.~ Hetero ring is six-membered consisting of two nitrogens and four carbon atoms (e.g., pyridazines, etc.) {4} |
| 252 | DF | .~.~.~ 1,2- or 1,4-diazine compound having two or more hetero rings {1} |
| 253 | DF | .~.~.~.~ Hetero ring other than 1,2- or 1,4-diazine is part of a polycyclo ring system {1} |
| 254 |  | .~.~.~.~.~ Diazine is bonded directly to the polycyclo ring system |