Synonyms: 1,5-Naphthalenedisulfonic acid, 3-(2-(4-amino-2-methylphenyl)diazenyl)-;3-((4-Amino-2-methylphenyl)azo)-1,5-naphthalenedisulfonic acid;1,5-Naphthalenedisulfonic acid, 3-((4-amino-2-methylphenyl)azo)-;3-((4-Amino-o-tolyl)azo)naphthalene-1,5-disulphonic acid;3-[(E)-(4-amino-2-methylphenyl)diazenyl]naphthalene-1,5-disulfonic acid;3-(4-amino-2-methyl-phenyl)azonaphthalene-1,5-disulfonic acid