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

5-[[4'-[(2-Amino-8-hydroxy-6-sulfo-1-naphtyl)azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]-2-hydroxybenzoic acid/sodium,(1:x) salt