((4-Amino-o-tolyl)azo)naphthalene-1,5-disulphonic acid, sodium salt 1,5-Naphthalenedisulfonic acid, ((4-amino-2-methylphenyl)azo)-, sodium salt 68400-80-6 EINECS 270-051-3 Sodium 7-(2-methyl-4-aminophenyl)azo-1,5-naphthalenedisulfonate