tetrasodium 2-[[4-[[4-[[6-[(4-aminobenzoyl)amino]-1-hydroxy-3-sulphonato-2-naphthyl]azo]-2,5-dimethoxyphenyl]azo]-6-sulphonato-1-naphthyl]azo]benzene-1,4-disulphonate

2-[[4-[[4-[[6-[(4-Aminobenzoyl)amino]-1-hydroxy-3-sulfonaphthalen-2-yl]azo]-2,5-dimethoxyphenyl]azo]-6-sulfonaphthalen-1-yl]azo]-1,4-benzenedisulfonic acid tetrasodium salt