| 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} |
| 875 | DF | .~.~.~.~ Nitrogen, other than as nitro or nitroso, attached indirectly to the azo group by nonionic bonding {2} |
| 876 | DF | .~.~.~.~.~ Oxygen bonded directly to carbon {1} |
| 877 | DF | .~.~.~.~.~.~ The nitrogen and the oxygen are bonded directly to the same bicyclo ring system {1} |
| 878 | DF | .~.~.~.~.~.~.~ Sulfonyl bonded directly to the bicyclo ring system {2} |
| 880 |  | .~.~.~.~.~.~.~.~ Additional sulfonyl which is attached indirectly to the bicyclo ring system by nonionic bonding |