| 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} |
| 816 |  | .~.~ Exactly two azo groups attached indirectly to each other by nonionic bonding {7} |
| 817 | DF | .~.~.~> Plural benzene rings bonded directly to the same urea or thiourea group and are between the azo groups {1} |
| 819 | DF | .~.~.~> Plural benzene rings bonded directly to the same carboxamide or sulfonamide group and are between the azo groups {1} |
| 821 | DF | .~.~.~> Plural benzene rings bonded directly to the same chalcogen or -C(=X)- group, wherein X is chalcogen, and are between the azo groups |
| 822 | DF | .~.~.~> Plural benzene rings bonded directly to each other and are between the azo groups {2} |
| 827 | DF | .~.~.~> Hydroxy bonded directly to a bicyclo ring system which is between the azo groups (H of hydroxy may be replaced by a substituted or unsubstituted ammonium ion or a Group IA or IIA light metal) {1} |
| 829 | DF | .~.~.~> Containing -C(=X)-, wherein X is chalcogen (e.g., carbonyl, etc.) {1} |
| 831 | DF | .~.~.~> Plural benzene rings bonded directly to each azo group {1} |