1,5-Naphthalenedisulfonic acid, 3-((4-amino-2-methylphenyl)azo)- 3-((4-Amino-2-methylphenyl)azo)-1,5-naphthalenedisulfonic acid 3-((4-Amino-o-tolyl)azo)naphthalene-1,5-disulphonic acid 84-94-6 EINECS 201-575-2