5-[(4-chlorobenzoyl)amino]-4-hydroxy-3-[[4-[(2-hydroxy-7-sulpho-1-naphthyl)azo]-2,5-dimethoxyphenyl]azo]naphthalene-2,7-disulphonic acid

5-[(4-Chlorobenzoyl)amino]-4-hydroxy-3-[[4-[(2-hydroxy-7-sulfonaphthalen-1-yl)azo]-2,5-dimethoxyphenyl]azo]-2,7-naphthalenedisulfonic acid