2-(3-chloro-4-fluorobenzyl)-8-hydroxy-6-cyclopropyl-2,3,4,4a,5,6-hexahydro-2,6-naphthyridine-1,7-dione                                                                                                                                                                                              以
                                                                                         
甲醇   、                                                                                         hexanes   、                                                                                         
乙醇   、                                                                                         
二乙胺                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 (+)-2-(3-chloro-4-fluorobenzyl)-8-hydroxy-6-cyclopropyl-2,3,4,4a,5,6-hexahydro-2,6-naphthyridine-1,7-dione   、                                                                                             (-)-2-(3-chloro-4-fluorobenzyl)-8-hydroxy-6-cyclopropyl-2,3,4,4a,5,6-hexahydro-2,6-naphthyridine-1,7-dione