tetrasodium 5,5'-[iminobis[(1-hydroxy-3-sulphonato-6,2-naphthylene)azo(2,5-dimethoxy-4,1-phenylene)azo]]bis(salicylate)

3,3'-[Iminobis[1-hydroxy-3-(sodiosulfo)-6,2-naphthalenediylazo(2,5-dimethoxy-4,1-phenylene)azo]]bis(6-hydroxybenzoic acid sodium) salt