2-Butenoic acid, 4-((4-((4-((1-oxopropyl)amino)phenyl)sulfonyl)phenyl)amino)-4-oxo- 4-((4-((4-((1-Oxopropyl)amino)phenyl)sulfonyl)phenyl)amino)-4-oxo-2-butenoic acid Crotonic acid, 4-(p-((p-propionamidophenyl)sulfonyl)anilino)-4-oxo- EM9259130