4-((5-Methoxy-4-((4-methoxyphenyl)azo)-2-methylphenyl)azo)benzenesulfonic acid, sodium salt 68555-86-2 72827-75-9 ACID ORANGE 156 Benzenesulfonic acid, 4-((5-methoxy-4-((4-methoxyphenyl)azo)-2-methylphenyl)azo)-, sodium salt EINECS 271-462-0 Sodium 4-((5-methoxy-4-((4-methoxyphenyl)azo)-2-methylphenyl)azo)benzenesulphonate