| 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 |  | .~.~.~ Plural benzene rings bonded directly to the azo group {5} |
| 840 | DF | .~.~.~.~> Each of the benzene rings is part of a bicyclo ring system {2} |
| 843 | DF | .~.~.~.~> Each of the benzene rings is monocyclic {3} |
| 860 | DF | .~.~.~.~> Acyclic -C(=X)- containing, wherein X is chalcogen (e.g., carbonyl, etc.) {1} |
| 875 | DF | .~.~.~.~> Nitrogen, other than as nitro or nitroso, attached indirectly to the azo group by nonionic bonding {2} |
| 882 | DF | .~.~.~.~> Oxygen double bonded directly to sulfur {1} |