trisodium 5-amino-3-[[4-[[4-[(2-amino-8-hydroxy-6-sulphonato-1-naphthyl)azo]benzoyl]amino]phenyl]azo]-4-hydroxynaphthalene-2,7-disulphonate

5-Amino-3-[[4-[[4-[(2-amino-8-hydroxy-6-sulfonaphthalen-1-yl)azo]benzoyl]amino]phenyl]azo]-4-hydroxy-2,7-naphthalenedisulfonic acid trisodium salt