2,7-Naphthalenedisulfonic acid, 4-amino-3-((4-((4-((2,4-diaminophenyl)azo)phenyl)sulfonyl)phenyl)azo)-5-hydroxy-6-(phenylazo)-, disodium salt 52204-07-6 Disodium 4-amino-3-((4-((4-((2,4-diaminophenyl)azo)phenyl)sulphonyl)phenyl)azo)-5-hydroxy-6-(phenylazo)naphthalene-2,7-disulphonate EINECS 257-732-0