| 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 |  | .~.~.~.~ 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} |
| 612 | DF | .~.~.~.~.~> Acyclic -C(=X)-, wherein X is chalcogen, attached directly or indirectly to the hetero ring by nonionic bonding |