4-((4-(4-Ethoxyphenylazo)-2,5-dimethoxyphenyl)azo)benzenesulfonic acid, sodium salt 67875-02-9 Benzenesulfonic acid, 4-((4-((4-ethoxyphenyl)azo)-2,5-dimethoxyphenyl)azo)-, sodium salt Benzenesulfonic acid, 4-((4-(4-ethoxyphenylazo)-2,5-dimethoxyphenyl)azo)-, sodium salt EINECS 267-517-3 Sodium 4-((4-((4-ethoxyphenyl)azo)-2,5-dimethoxyphenyl)azo)benzenesulphonate