5-amino-4-hydroxy-3-[[2-methoxy-5-methyl-4-[[8-[(phenylsulphonyl)oxy]-3,6-disulpho-1-naphthyl]azo]phenyl]azo]naphthalene-2,7-disulphonic acid

5-Amino-4-hydroxy-3-[[2-methoxy-5-methyl-4-[[8-[(phenylsulfonyl)oxy]-3,6-disulfonaphthalen-1-yl]azo]phenyl]azo]-2,7-naphthalenedisulfonic acid