3-((3-Methoxy-4-((4-methoxyphenyl)azo)phenyl)azo)benzenesulfonic acid, sodium salt 63405-85-6 Acid Yellow 4R Benzenesulfonic acid, 3-((3-methoxy-4-((4-methoxyphenyl)azo)phenyl)azo)-, sodium salt EINECS 264-129-6 Erionyl Yellow 4R Sodium 3-((3-methoxy-4-((4-methoxyphenyl)azo)phenyl)azo)benzenesulfonate Sodium 3-((3-methoxy-4-((4-methoxyphenyl)azo)phenyl)azo)benzenesulphonate