| 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} |
| 660 | DF | .~.~ Hydroxy and carbonyl of -C00- bonded directly to a monocyclic benzene ring (H or hydroxy may be replaced by a substituted or unsubstituted ammonium ion or a metal) {5} |
| 666 |  | .~.~.~ At least three azo groups attached indirectly to each other by nonionic bonding {3} |
| 667 | DF | .~.~.~.~> Plural monocyclic benzene rings, each having hydroxy and carbonyl of -COO- bonded directly thereto |
| 668 | DF | .~.~.~.~> Additional monocyclic benzene ring having plural hydroxy groups, hydroxy and nitrogen, or plural nitrogens bonded directly thereto, wherein the nitrogen is other than as nitro, nitroso or azo |
| 669 | DF | .~.~.~.~> Additional -C(=X)-, wherein X is chalcogen |