5-[[4'-[(2-amino-8-hydroxy-6-sulphonaphthalen-1-yl)azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]salicylic acid

5-[[4'-[(2-Amino-8-hydroxy-6-sulfo-1-naphthalenyl)azo]-3,3'-dimethyl-1,1'-biphenyl-4-yl]azo]-2-hydroxybenzoic acid