3-hydroxy-4-[[4'-[[1-hydroxy-6-(phenylamino)-3-sulpho-2-naphthyl]azo]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl]azo]naphthalene-2,7-disulphonic acid

3-Hydroxy-4-[[4'-[[1-hydroxy-6-(phenylamino)-3-sulfo-2-naphthalenyl]azo]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl]azo]-2,7-naphthalenedisulfonic acid