tetrasodium 7-amino-3-[[2,5-dimethoxy-4-[[7-sulphonato-4-[(2-sulphonatophenyl)azo]naphthyl]azo]phenyl]azo]-4-hydroxy-8-[(3-sulphonatophenyl)azo]naphthalene-2-sulphonate

7-Amino-3-[2,5-dimethoxy-4-[7-(sodiosulfo)-4-[2-(sodiosulfo)phenylazo]-1-naphthalenylazo]phenylazo]-4-hydroxy-8-[3-(sodiosulfo)phenylazo]-2-naphthalenesulfonic acid sodium salt