1-Phenyl-2-buten-1-one495-41-031 % similar Ethyl (2E)-3-ethoxy-2-propenoate5941-55-931 % similar Dimethyl penta-2,3-dienedioate1712-36-331 % similar Methyl acrylate96-33-331 % similar Methyl 4-bromo-2-butenoate1117-71-130 % similar Methyl (2E)-4-bromo-2-butenoate6000-00-630 % similar 5-Methyl-2-hepten-4-one81925-81-730 % similar Methyl 4,4,4-trifluorocrotonate85694-31-130 % similar