| 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} |
| 692 | DF | .~.~ Heavy metal or aluminum containing {7} |
| 701 | DF | .~.~.~ Hetero ring containing {2} |
| 702 | DF | .~.~.~.~ Polycyclo ring system containing the hetero ring as one of the cyclos {1} |
| 703 | DF | .~.~.~.~.~ Azo bonded directly to the polycyclo ring system {3} |
| 704 |  | .~.~.~.~.~.~ The azo group is attached indirectly in the same azo moiety to an additional azo group or to an acyclic chain which contains a -CH=N- group by nonionic bonding |