1,5-Naphthalenedisulfonic acid, 3-((3-methoxy-4-((methylsulfonyl)amino)phenyl)azo)- 3-((3-Methoxy-4-((methylsulphonyl)amino)phenyl)azo)naphthalene-1,5-disulphonic acid 68834-08-2 7-((4-Methylsulfonylamino-3-methoxyphenyl)azo)-1,5-naphthalenedisulfonic acid EINECS 272-434-0