trisodium 4-amino-3-[[4'-[(2-amino-4-hydroxyphenyl)azo][1,1'-biphenyl]-4-yl]azo]-5-hydroxy-6-[(4-methoxy-2-sulphonatophenyl)azo]naphthalene-2,7-disulphonate

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