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

dibenzyl α-chloro-2-<2-(methylsulfinyl)-2-(methylthio)ethyl>-4-oxo-1-azetidinemalonate

dibenzyl 1-bromo-2-(methylthio)carbapenam-3,3-dicarboxylate

benzyl 2-(methylthio)carbapen-1-em-3-carboxylate

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