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IUPAC Name: 4-amino-3-[4-[4-(2,4-diaminophenyl)diazenylphenyl]phenyl]diazenyl-5-oxo-6-(phenylhydrazinylidene)naphthalene-2,7-disulfonic acid; sodium Synonyms: Calcomine Black, Meta Black, Carbide Black E, Diazine Black E, Fenamin Black E, Fixanol Black E, Direct Black A, Direct Black E, Direct Black N, Direct Black Z, Formic Black C, Amanil Black GL, Amanil Black WD, Direct Black CX, Direct Black EW, Direct Black EX, Direct Black FR, Direct Black GW, Direct Black GX, Direct Black RX