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

1-Amino-2-[4'-(2,4-diaminophenylazo)-3,3'-dimethoxy-1,1'-biphenyl-4-ylazo]-8-hydroxy-7-phenylazo-3,6-naphthalenedisulfonic acid disodium salt