ethyl 3,4-dimethyl-2-oxo-1-((phenylthio)methyl)cyclopent-3-ene-1-carboxylate

ethyl 3-methyl-2-oxo-4-(phenylthio)-1-((phenylthio)methyl)cyclopent-3-ene-1-carboxylate

3-(1,1-dihydroxypropyl)glutaric acid di-γ-lactone

丙酸酐

3,4-二甲基-3-戊烯-2-酮