2,7-Naphthalenedisulfonic acid, 4-amino-3-((4-((4-((2,4-diaminophenyl)azo)phenyl)amino)-3-sulfophenyl)azo)-5-hydroxy-6-(phenylazo)-, trisodium salt 72906-15-1 EINECS 276-990-5 Trisodium 4-amino-3-((4-((4-((2,4-diaminophenyl)azo)phenyl)amino)-3-sulphonatophenyl)azo)-5-hydroxy-6-(phenylazo)naphthalene-2,7-disulphonate