3-[[4-[[8-(benzoylamino)-1-hydroxy-3,6-disulpho-2-naphthyl]azo]-2,5-dimethoxyphenyl]azo]-4-hydroxy-5-[[4-(methylsulphonyl)benzoyl]amino]naphthalene-2,7-disulphonic acid

3-[[4-[[8-(Benzoylamino)-1-hydroxy-3,6-disulfonaphthalen-2-yl]azo]-2,5-dimethoxyphenyl]azo]-4-hydroxy-5-[[4-(methylsulfonyl)benzoyl]amino]-2,7-naphthalenedisulfonic acid