tetrasodium 5-amino-3-[[4-[[4-[(8-amino-1-hydroxy-3,6-disulphonato-2-naphthyl)azo]-5-methoxy-o-tolyl]azo]phenyl]azo]-4-hydroxynaphthalene-2,7-disulphonate

5-Amino-3-[[4-[[4-[[8-amino-1-hydroxy-3,6-bis(sodiosulfo)-2-naphtyl]azo]-5-methoxy-2-methylphenyl]azo]phenyl]azo]-4-hydroxy-2,7-naphthalenedisulfonic acid disodium salt