a class of antibiotics with a β-lactam structure
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(3R*,4S*)-1-(4-hydroxymethyl-2-oxo-2,5-dihydrofuran-3-yl)-4-methylthio-3-phenylacetamino-azetidin-2-one
(6R,7S)-7-[2-(2-Amino-thiazol-4-yl)-acetylamino]-3-(1-methyl-1H-tetrazol-5-ylsulfanylmethyl)-8-oxo-5-oxa-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester
