trisodium 4-amino-3-[[4-[[[4-[(7-amino-1-hydroxy-3-sulphonato-2-naphthyl)azo]phenyl]amino]carbonyl]phenyl]azo]-5-hydroxy-6-(phenylazo)naphthalene-2,7-disulphonate

4-Amino-3-[4-[4-[7-amino-1-hydroxy-3-(sodiosulfo)-2-naphthalenylazo]phenylaminocarbonyl]phenylazo]-5-hydroxy-6-(phenylazo)-2,7-naphthalenedisulfonic acid disodium salt