7-[2-Methyl-4-(1-hydroxy-3-sulfo-6-amino-2-naphtylazo)-5-methoxyphenylazo]-1,3-naphthalenedisulfonic acid

7-[[4-[(6-Amino-1-hydroxy-3-sulfonaphthalen-2-yl)azo]-5-methoxy-2-methylphenyl]azo]naphthalene-1,3-disulfonic acid