2-(4-((4-(2-(4-Nitro-2-sulfophenyl)ethenyl)-3-sulfophenyl)azo)phenyl)-2H-naphtho(1,2-d)triazole-6,8-disulfonic acid, tetrasodium salt 2H-Naphtho(1,2-d)triazole-6,8-disulfonic acid, 2-(4-((4-(2-(4-nitro-2-sulfophenyl)ethenyl)-3-sulfophenyl)azo)phenyl)-, tetrasodium salt 71566-42-2 EINECS 275-636-7 Tetrasodium 2-(4-((4-(2-(4-nitro-2-sulphonatophenyl)vinyl)-3-sulphonatophenyl)azo)phenyl)naphtho(1,2-d)triazole-6,8-disulphonate