disodium 6-amino-3-[[4'-[(6-amino-1-hydroxy-3-sulphonato-2-naphthyl)azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]-4-hydroxynaphthalene-2-sulphonate

6-Amino-3-[[4'-[[6-amino-1-hydroxy-3-(sodiooxysulfonyl)-2-naphthalenyl]azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]-4-hydroxy-2-naphthalenesulfonic acid sodium salt