Synonyms: 4-[(4-amino-5-methoxy-o-tolyl)azo]-5-hydroxynaphthalene-2,7-disulphonic acid;4-[(4-Amino-5-methoxy-2-methylphenyl)azo]-5-hydroxy-2,7-naphthalenedisulfonic acid;2,7-Naphthalenedisulfonic acid, 4-((4-amino-5-methoxy-2-methylphenyl)azo)-5-hydroxy-;2,7-Naphthalenedisulfonic acid, 4-(2-(4-amino-5-methoxy-2-methylphenyl)diazenyl)-5-hydroxy-;4-Hydroxy-5-(4-amino-5-methoxy-2-methyl phenyl)azo-2,7-naphthalenedisulfonic acid;Einecs 268-428-2