[(2R,3R,4R,5S)-2-Benzyloxy-5-(2,2-dimethyl-[1,3]dioxolan-4-yl)-4-hydroxy-tetrahydro-furan-3-yl]-carbamic acid benzyl ester   、                                                                                      
禾大壮                                                                                                                                                                                                                                                                                                          生成                                                 2-[(2S,3R,4R,5R)-2-(2,2-dimethyl-1,3-dioxolan-4-yl)-5-phenylmethoxy-4-(phenylmethoxycarbonylamino)oxolan-3-yl]oxypropanoic acid