2-Butenoic acid, 4-((4-((4-(acetylamino)phenyl)sulfonyl)phenyl)amino)- 4-((4-((4-(Acetylamino)phenyl)sulfonyl)phenyl)amino)-2-butenoic acid Crotonic acid, 4-(p-((p-acetamidophenyl)sulfonyl)anilino)-4-oxo- EM9055000