(2S)-5-amino-2-({[1-(3,5-difluorobenzyl)-2-oxo-1,2-dihydropyridin-3-yl]carbonyl}amino)pentanoic acid trifluoroacetate   、                                                                                      
乙醇   、                                                                                      
乙基乙酰亚胺盐酸盐                                                                                                                                                                                              以
                                                                                         
三乙胺                                                                                  为溶剂,
                                                                                                                                                    反应 16.0h,
                                                                                                                以to give (2S)-2-({[1-(3,5-difluorobenzyl)-2-oxo-1,2-dihydropyridin-3-yl]carbonyl}amino)-5-(ethanimidoylamino)pentanoic acid•TFA (117, 41 mg) as a white solid的产率得到(2S)-2-({[1-(3,5-difluorobenzyl)-2-oxo-1,2-dihydropyridin-3-yl]carbonyl}amino)-5-(ethanimidoylamino)pentanoic acid trifluoroacetate