sodium 4-[[4-[(4-ethoxy-m-tolyl)azo]-2,5-dimethoxyphenyl]azo]benzenesulphonate

4-[[4-[(4-Ethoxy-3-methylphenyl)azo]-2,5-dimethoxyphenyl]azo]benzenesulfonic acid sodium salt

Benzenesulfonic acid, 4-[[4-[(4-ethoxy-3-methylphenyl) azo]-2,5-dimethoxyphenyl]azo]-, sodium salt