(2S,5R,6R)-6-((S)-1-Hydroxy-2-oxo-2-phenyl-ethyl)-3,3-dimethyl-7-oxo-4-thia-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid allyl ester 生成 prop-2-enyl (2S,4S,5R,6R)-6-[(1S)-1-hydroxy-2-oxo-2-phenylethyl]-3,3-dimethyl-4,7-dioxo-4λ4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate