trisodium 4-[[8-amino-7-[[4'-[(2-amino-4-hydroxyphenyl)azo][1,1'-biphenyl]-4-yl]azo]-1-hydroxy-3,6-disulphonato-2-naphthyl]azo]benzoate

4-[[8-Amino-7-[[4'-[(2-amino-4-hydroxyphenyl)azo]-1,1'-biphenyl-4-yl]azo]-1-hydroxy-3,6-bis(sodiosulfo)-2-naphthalenyl]azo]benzoic acid sodium salt