2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-3-((4-nitrophenyl)azo)-6-((4-sulfophenyl)azo)-, trisodium salt 5850-37-3 EINECS 227-450-2 Trisodium 4-amino-5-hydroxy-3-((4-nitrophenyl)azo)-6-((4-sulphonatophenyl)azo)naphthalene-2,7-disulphonate