| 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} |
| 617 | DF | .~.~ Fiber- or substrate-reactive azo compound {5} |
| 630 | DF | .~.~.~ Halogen attached directly to a hetero ring or to an alicyclic ring by nonionic bonding {2} |
| 632 |  | .~.~.~.~ The hetero ring is six-membered and contains at least two nitrogens {5} |
| 633 | DF | .~.~.~.~.~> Polycyclo ring system having the hetero ring as one of the cyclos |
| 634 | DF | .~.~.~.~.~> At least two such hetero rings attached indirectly to each other by nonionic bonding |
| 635 | DF | .~.~.~.~.~> Additional hetero ring containing {1} |
| 637 | DF | .~.~.~.~.~> Plural azo groups attached indirectly to each other by nonionic bonding |
| 638 | DF | .~.~.~.~.~> The hetero ring and benzene ring, to which an azo group is bonded directly, bonded directly to the same nitrogen |