diphenylmethyl (6R,7R)-7-[(Z)-2-(5-tritylamino-1,2,4-thiadiazol-3-yl)-2-fluoromethoxyiminoacetamido]-3-(3-chloro-1-propenyl)-3-cephem-4-carboxylate   、                                                                                      
3-carbamoylimidazo[5,1-b]thiazole                                                                                                                                                                                                                                                                                                          以34%的产率得到(6R,7R)-7-[(Z)-2-(5-amino-1,2,4-thiadiazol-3-yl)-2-fluoro methoxyiminoacetamido]-3-[3-(3-carbamoylimidazo [5,1-b]thiazolium-6-yl)-1-propenyl]-3-cephem-4-carboxylate