68444-09-7 Benzenesulfonic acid, 4-((4-((4-ethoxy-3-methylphenyl)azo)-2,5-dimethoxyphenyl)azo)-, sodium salt EINECS 270-581-5 Sodium 4-((4-((4-ethoxy-m-tolyl)azo)-2,5-dimethoxyphenyl)azo)benzenesulphonate