| 552 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
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| * | DD | ORGANIC COMPOUNDS (Class 532, subclass 1) {11} |
| 101 | DF | .~ Acyclic carbon bonded directly to three benzene rings or to two benzene rings and a cyclohexadienyl ring, which acyclic carbon may not be bonded to a fourth carbon (e.g., triphenylmethane dyestuffs, etc.) {12} |
| 113 |  | .~.~ Nitrogen bonded directly to one of the rings (e.g., malachite green, rosophenoline, etc.) {1} |
| 114 | DF | .~.~.~> Nitrogen bonded directly to each of the rings (e.g., rosaniline, crystal violet, etc.) |