ethyl (2S)-2-{[(1-benzyl-2-oxo-1,2-dihydropyridin-3-yl)carbonyl]amino}-6-{[(4-methylphenyl)sulfonyl]amino}hexanoate   、                                                                                      
sodium hydroxide                                                                                                                                                                                              以
                                                                                         
乙醇                                                                                  为溶剂,
                                                                                                                                                                                        以to provide 52 mg (2S)-2-{[(1-benzyl-2-oxo-1,2-dihydropyridin-3-yl)carbonyl]amino}-6-{[(4-methylphenyl)sulfonyl]amino} hexanoic acid的产率得到(2S)-2-{[(1-benzyl-2-oxo-1,2-dihydropyridin-3-yl)carbonyl]amino}-6-{[(4-methylphenyl)sulfonyl]amino}hexanoic acid