| 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} |
| 751 | DF | .~.~ Hetero ring containing {5} |
| 753 | DF | .~.~.~ Azo bonded directly to the hetero ring or to a polycyclo ring system which contains the hetero ring as one of the cyclos {11} |
| 756 |  | .~.~.~.~ Two azo groups attached indirectly to each other by nonionic bonding {5} |
| 757 | DF | .~.~.~.~.~> Additional hetero ring or polycyclo ring system which contains a hetero ring as one of the cyclos bonded directly to an azo group {2} |
| 761 | DF | .~.~.~.~.~> Both azo groups are bonded directly to the hetero ring or to the polycyclo ring system |
| 762 | DF | .~.~.~.~.~> Polycyclo ring system having at least three cyclos, at least one of which is a hetero ring |
| 763 | DF | .~.~.~.~.~> Bicyclo carbocyclic ring system |
| 764 | DF | .~.~.~.~.~> Additional ring bonded directly to the hetero ring or to the polycyclo ring system |