| 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} |
| 840 |  | .~.~.~.~ Each of the benzene rings is part of a bicyclo ring system {2} |
| 841 | DF | .~.~.~.~.~> Containing -C(=X)-, wherein X is chalcogen (e.g., carbonyl, etc.) |
| 842 | DF | .~.~.~.~.~> Hydroxy bonded directly at the 2-position of the bicyclo ring system (H of hydroxy may be replaced by the ammonium ion or a Group IA or IIA light metal) |