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12Practical synthetic approach to 4-acetoxy-2-azetidinone for the preparation of carbapenem and penem antibiotics, Research on Chemical Intermediates Synthetic studies on carbapenem and penem antibiotics(VI) improved synthesis of (3S,4S)-4-acetoxy-3-phenylacetamido-azetidin-2-one, Archives of Pharmacal Research 4-Vinyloxyazetidin-2-one, a Novel Substrate for ??-Lactam Synthesis, Beta-Lactams Synthese von 4-Acetoxy-1-aryl-2-azetidinonen, Monatshefte f??r Chemie / Chemical Monthly