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

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