咪唑   、                                                                                      
4-Nitrobenzyl 2[4(S)-chloro-3(S)-{1(R)-hydroxyethyl}azetidin-2-on-1-yl]-3-(2-cyanophenoxy)-3-trimethylacetylthio-propenate                                                                                                                                                                                                                                                                                                          生成                                                 4-Nitrobenzyl 5(R)-3-(2-cyanophenoxy)-6(S)-{1(R)-hydroxyethyl}-7-oxo-4-thia-1-azabicyclo[3,2,0]hept-2-ene-2-carboxylate