2,7-Naphthalenedisulfonic acid, 5-((2,4-dihydroxy-5-((4-((4-nitro-2-sulfophenyl)amino)phenyl)azo)phenyl)azo)-4-hydroxy-3-((4-((4-nitro-2-sulfophenyl)amino)phenyl)azo)-, tetrasodium salt 70210-34-3 EINECS 274-430-4 Tetrasodium 5-((2,4-dihydroxy-5-((4-((4-nitro-2-sulphonatophenyl)amino)phenyl)azo)phenyl)azo)-4-hydroxy-3-((4-((4-nitro-2-sulphonatophenyl)amino)phenyl)azo)naphthalene-2,7-disulphonate