1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-((4-((3-phosphonophenyl)azo)-2-sulfophenyl)azo)-, monoammonium trisodium salt 1-((4-((3-Phosphonophenyl)azo)-2-sulfophenyl)azo)-2-hydroxy-6,8-naphthalenedisulfonic acid, trisodium monoammonium salt 70729-64-5 Ammonium trisodium 7-hydroxy-8-((4-((m-phosphonatophenyl)azo)-2-sulphonatophenyl)azo)naphthalene-1,3-disulphonate EINECS 274-827-2