2,7-Naphthalenedisulfonic acid, 4-((4-amino-5-methoxy-2-methylphenyl)azo)-5-hydroxy- 4-((4-Amino-5-methoxy-o-tolyl)azo)-5-hydroxynaphthalene-2,7-disulphonic acid 4-Hydroxy-5-(4-amino-5-methoxy-2-methyl phenyl)azo-2,7-naphthalenedisulfonic acid 68084-16-2 EINECS 268-428-2