tetrasodium 2,2'-[(1,4-dioxo-2-butene-1,4-diyl)bis[imino(2-methyl-4,1-phenylene)azo]]bis[5-[(4-sulphonatophenyl)azo]benzenesulphonate]

2,2'-[(1,4-Dioxo-2-butene-1,4-diyl)bis[imino(2-methyl-4,1-phenylene)azo]]bis[5-[[4-(sodiosulfo)phenyl]azo]benzenesulfonic acid sodium] salt

Benzenesulfonic acid, 2,2'-[(1,4-dioxo-2-butene-1,4-diyl)bis[imino (2-methyl-4,1-phenylene)azo]]bis[5-[(4-sulfophenyl)azo]-, tetrasodium salt