dibenzyl (E)-2-<2-(methylthio)vinyl>-4-oxo-1-azetidinemalonate

dibenzyl 2-<2,2-bis(methylthio)ethyl>-4-oxo-1-azetidinemalonate

dibenzyl 2-(methylthio)carbapen-1-em-3,3-dicarboxylate

4-(2-Methanesulfinyl-2-methylsulfanyl-ethyl)-azetidin-2-one

benzyl (+/-)-2-(methylthio)carbapen-2-em-3-carboxylate