trisodium 5-[[4-[[4-[(6-amino-1-hydroxy-3-sulphonato-2-naphthyl)azo]-1-naphthyl]azo]-6-sulphonato-1-naphthyl]azo]salicylate

5-[[4-[[4-[(6-Amino-1-hydroxy-3-sulfonaphthalen-2-yl)azo]naphthalen-1-yl]azo]-6-sulfonaphthalen-1-yl]azo]-2-hydroxybenzoic acid trisodium salt