[4-(6,5-dioxo-6,5-dihydro-pyrrol-4-yl)-phenyl]acetic acid methyl ester   、                                                                                      
N-phenyl-{4-[N-(6-methyl-pyridin-6-yl)benzamide]} nitrone                                                                                                                                                                                              以
                                                                                         
氘代氯仿                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 endo-(4-{7-[4-(6-methyl-pyridin-6-ylcarbamoyl)-phenyl]-4,6-dioxo-6-phenyl-hexahydro-pyrrolo[7,4-d]isoxazol-5-yl}-phenyl)acetic acid methyl ester   、                                                                                             exo-(4-{7-[4-(6-methyl-pyridin-6-ylcarbamoyl)-phenyl]-4,6-dioxo-6-phenyl-hexahydro-pyrrolo[7,4-d]isoxazol-5-yl}-phenyl)acetic acid methyl ester