{(1S,2S)-2-Methyl-1-[(2S,5S)-2-methyl-5-((2S,4R)-4-methyl-5-oxo-tetrahydro-furan-2-yl)-3-oxo-[1,4]diazecane-1-carbonyl]-butyl}-carbamic acid tert-butyl ester   、                                                                                      
(S)-2-Amino-3-methyl-N-pyridin-4-ylmethyl-butyramide                                                                                                                                                              在
                                                                                                                                                                                 
2-羟基吡啶                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 {(1S,2S)-1-[(2S,5S)-5-((1S,3R)-1-Hydroxy-3-{(S)-2-methyl-1-[(pyridin-4-ylmethyl)-carbamoyl]-propylcarbamoyl}-butyl)-2-methyl-3-oxo-[1,4]diazecane-1-carbonyl]-2-methyl-butyl}-carbamic acid tert-butyl ester