Description: 534 organic compounds -- part of the class 532-570 series / 534 organic compounds -- part of the class 532-570 series/() organic compounds (class 532, subclass 1) (573) azo (682) plural hydroxy groups or esters thereof bonded directly to a monocyclic benzene ring (h of hydroxy may be replaced by a substituted or unsubstituted ammonium ion or metal) (683) azo bonded directly to the benzene ring (685) at least three azo groups attached indirectly to each other by nonionic bonding (687) plural monocyclic benzene rings, each having plural hydroxy groups or esters thereof bonded directly thereto
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