disodium 4-amino-3-[[4'-[(2-amino-4-hydroxyphenyl)azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]-5-hydroxy-6-[(4-methoxyphenyl)azo]naphthalene-2,7-disulphonate

4-Amino-3-[4'-(2-amino-4-hydroxyphenylazo)-3,3'-dimethyl-1,1'-biphenyl-4-ylazo]-5-hydroxy-6-(4-methoxyphenylazo)-2,7-naphthalenedisulfonic acid disodium salt