3-furan-3-yl-N-(6-methylpyridin-2-yl)-propionamide   、                                                                                      
2,5-二氢-2,5-二氧代-1H-吡咯-1-乙酸甲酯                                                                                                                                                                                              以
                                                                                         
氘代氯仿                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 exo-{8-[2-(6-methylpyridin-2-ylcarbamoyl)-ethyl]-3,5-dioxo-10-oxa-4-azatricyclo[5.2.1.0
2,6]dec-8-en-4-yl}acetic acid methyl ester   、                                                                                             endo-{8-[2-(6-methylpyridin-2-ylcarbamoyl)-ethyl]-3,5-dioxo-10-oxa-4-azatricyclo[5.2.1.0
2,6]dec-8-en-4-yl}acetic acid methyl ester