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

4-Amino-3-[[4'-(2-amino-4-hydroxyphenylazo)-3,3'-dimethoxy-1,1'-biphenyl-4-yl]azo]-5-hydroxy-6-(phenylazo)-2,7-naphthalenedisulfonic acid disodium salt