CBZ-L-缬氨酸   、                                                                                      (10S,13R)-13-[(1R,2S)-2-amino-1-hydroxy-3-phenylpropyl]-10-propan-2-yl-2,5-dioxa-8,11,14-triazabicyclo[14.3.1]icosa-1(19),16(20),17-triene-9,12-dione                                                                                                                                                              在
                                                                                                                                                                                 
盐酸-N-乙基-Nˊ-(3-二甲氨基丙基)碳二亚胺   、                                                                                                  
三乙胺   、                                                                                                  
3-羟基-1,2,3-苯并三嗪-4(3H)-酮                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
1,4-二氧六环                                                                                  为溶剂,
                                                                                                                                                                                        以45%的产率得到Carbamic acid, (1-(((2-hydroxy-2-(10-(1-methylethyl)-9,12-dioxo-2,5-dioxa-8,11,14-triazabicyclo(1431)eicosa-1(20),16,18-trien-13-yl)-1-(phenylmethyl)ethyl)amino)carbonyl)-2-methylpropyl)-, phenylmethyl ester, (10S-(10R*,13S*(1R*(R*),2S*)))-