(S)-2-Amino-3-[4-(pyridin-4-ylmethoxy)-phenyl]-propionic acid tert-butyl ester   、                                                                                      
(S)-2-[(Azepane-1-carbonyl)-amino]-4-methyl-pentanoic acid                                                                                                                                                                                                                                                                                                          生成                                                 [S-(R*,R*)]-2-{2-[(Azepane-1-carbonyl)-amino]-4-methyl-pentanoylamino}-3-[4-(pyridin-4-ylmethoxy)-phenyl]-propionic acid tert-butyl ester