5-[[4'-[[8-[[2,4-dihydroxy-3-[(2-methoxy-5-sulphophenyl)azo]phenyl]azo]-1-hydroxy-3,6-disulpho-2-naphthyl]azo]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl]azo]salicylic acid, sodium salt

5-[[4'-[[8-[[2,4-Dihydroxy-3-[(2-methoxy-5-sulfophenyl)azo]phenyl]azo]-1-hydroxy-3,6-disulfo-2-naphtyl]azo]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl]azo]-2-hydroxybenzoic acid/sodium,(1:x) salt