8-[[1-hydroxy-6-(phenylamino)-3-sulpho-2-naphthyl]azo]-5-[[6-sulpho-4-[(3-sulphophenyl)azo]-1-naphthyl]azo]naphthalene-2-sulphonic acid, sodium salt

2-Naphthalenesulfonic acid, 8-[[1-hydroxy-6-(phenylamino) -3-sulfo-2-naphthalenyl]azo]-5-[[6-sulfo-4-[(3 -sulfophenyl)azo]-1-naphthalenyl]azo]-, sodium salt