| 514 / | HD | DRUG, BIO-AFFECTING AND BODY TREATING COMPOSITIONS |
| 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} |
| 354 | DF | .~.~.~ C=O bonded directly to the six-membered hetero ring {1} |
| 355 | DF | .~.~.~.~ At 3-position {1} |
| 356 | | .~.~.~.~.~ C=O in a C(=O)O group (e.g., nicotinic acid, etc.) |