trisodium 3-[[4-[(6-amino-1-hydroxy-3-sulphonato-2-naphthyl)azo]-5-methoxy-o-tolyl]azo]naphthalene-1,5-disulphonate

3-[[4-[(6-Amino-1-hydroxy-3-sodiosulfo-2-naphthalenyl)azo]-5-methoxy-2-methylphenyl]azo]-1,5-naphthalenedisulfonic acid disodium salt