| 534 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
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| * | DD | ORGANIC COMPOUNDS (CLASS 532, SUBCLASS 1) {8} |
| 573 | DF | .~ Azo {51} |
| 838 | DF | .~.~ Exactly one azo group containing or azo attached indirectly to an additional azo group by ionic bonding {3} |
| 839 | DF | .~.~.~ Plural benzene rings bonded directly to the azo group {5} |
| 843 | DF | .~.~.~.~ Each of the benzene rings is monocyclic {3} |
| 844 |  | .~.~.~.~.~ Sulfonyl containing {3} |
| 845 | DF | .~.~.~.~.~.~> Oxygen bonded directly to the sulfonyl group (e.g., sulfonic acid, etc.) {1} |
| 847 | DF | .~.~.~.~.~.~> The sulfonyl is part of a sulfonamide group (-(0=)S(=0)HNH, wherein substitution may be made for hydrogen only) |
| 848 | DF | .~.~.~.~.~.~> Containing -C(=X)-, wherein X is chalcogen {1} |