a naturally occurring S-lactamase inhibitor
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(2R,5R)-3-[2-Dibenzylamino-eth-(Z)-ylidene]-7-oxo-4-oxa-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid benzyl ester
erythro-5-amino-3-hydroxy-2-(2-oxoazetidin-1-yl)valeric acid
4-(triphenylmethylthio)azetidin-2-one