pentasodium 5-[[6-amino-1-hydroxy-3-sulphonato-5-[(3-sulphonatophenyl)azo]-2-naphthyl]azo]-6-methoxy-8-[[7-sulphonato-4-[(3-sulphonatophenyl)azo]naphthyl]azo]naphthalene-2-sulphonate

2-Naphthalenesulfonic acid, 5-[[6-amino-1-hydroxy-3-sulfo- 5-[(3-sulfophenyl)azo]-2-naphthalenyl]azo]-6 -methoxy-8-[[7-sulfo-4-[(3-sulfophenyl)azo]-1-naphthaleny l]azo]-, pentasodium salt