trisodium 5-[(7-amino-1-hydroxy-3-sulphonato-2-naphthyl)azo]-8-[[4-(phenylazo)-7-sulphonatonaphthyl]azo]naphthalene-2-sulphonate

5-[(7-Amino-1-hydroxy-3-sulfonaphthalen-2-yl)azo]-8-[[4-(phenylazo)-7-sulfonaphthalen-1-yl]azo]-2-naphthalenesulfonic acid trisodium salt

2-Naphthalenesulfonic acid, 5-[(7-amino-1-hydroxy-3-sulfo- 2-naphthalenyl)azo]-8-[[4-(phenylazo)-7-sulfo -1-naphthalenyl]azo]-, trisodium salt