| 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} |
| 603 | DF | .~.~ Quaternary ammonium or hydrazinium attached indirectly to an azo group by nonionic bonding {4} |
| 604 | DF | .~.~.~ Hetero ring containing {1} |
| 605 | DF | .~.~.~.~ The pentavalent nitrogen is a ring member {2} |
| 606 | DF | .~.~.~.~.~ Azo bonded directly to a hetero ring or to a polycyclo ring system having a hetero ring as one of the cyclos {1} |
| 607 |  | .~.~.~.~.~.~ The hetero ring contains the pentavalent nitrogen {4} |
| 608 | DF | .~.~.~.~.~.~.~> Plural azo groups in the same azo moiety attached indirectly to each other by nonionic bonding |
| 609 | DF | .~.~.~.~.~.~.~> Acyclic carbon bonded directly to the azo group |
| 610 | DF | .~.~.~.~.~.~.~> Additional hetero ring or polycyclo ring system having a hetero ring as one of the cyclos bonded directly to the azo group |
| 611 | DF | .~.~.~.~.~.~.~> The hetero ring is one of the cyclos in a polycyclo ring system |