| 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} |
| 676 | DF | .~.~ Plural -HNH groups or -OH and -HNH bonded directly to a monocyclic benzene ring (H of -OH may be replaced by a substituted or unsubstituted ammonium ion or metal) {2} |
| 677 | DF | .~.~.~ Plural azo groups in the same azo moiety attached indirectly to each other by nonionic bonding {1} |
| 678 | DF | .~.~.~.~ Sulfonic acid group containing (-(0=)S(=0)-OH, wherein H of -OH may be replaced by a substituted or unsubstituted ammonium ion or metal) {2} |
| 680 |  | .~.~.~.~.~ Exactly three azo groups attached indirectly to each other by nonionic bonding |