5(4H)-Oxazolone, 2-(4-bromophenyl)-4-(1-ethoxybutylidene)-, (4Z)-   、                                                                                      (S)-Azetidine-2-carboxylic acid [(S)-1-carbamoyl-2-(4-hydroxy-phenyl)-ethyl]-amide                                                                                                                                                                                              以
                                                                                         
四氢呋喃   、                                                                                         
二甲基亚砜                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 (S)-1-{1-[2-(4-Bromo-phenyl)-5-oxo-oxazol-(4Z)-ylidene]-butyl}-azetidine-2-carboxylic acid [(S)-1-carbamoyl-2-(4-hydroxy-phenyl)-ethyl]-amide