| 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 |  | .~.~ Hetero ring containing {5} |
| 752 | DF | .~.~.~> Polycyclo ring system having a hetero atom shared by at least two rings or at least two hetero atoms which are not members of the same ring |
| 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} |
| 796 | DF | .~.~.~> At least three azo groups attached indirectly to each other by nonionic bonding |
| 797 | DF | .~.~.~> Two azo groups attached indirectly to each other by nonionic bonding |
| 798 | DF | .~.~.~> Plural carbocyclic rings bonded directly to the azo group {4} |