(R)-2-((S)-2-Benzyloxycarbonylamino-propionylamino)-pentanedioic acid 1-benzyl ester 5-[(2S,4R,5R,6R)-6-((R)-1,2-dihydroxy-ethyl)-4,5-dihydroxy-tetrahydro-pyran-2-carbonyloxymethyl] ester                                                                                                                                                              在
                                                                                                                                                                                 
氢气                                                                                                                                  作用下,
                                                                                                                                                                                                                            以83%的产率得到(R)-2-((S)-2-Amino-propionylamino)-pentanedioic acid 5-[(2S,4R,5R,6R)-6-((R)-1,2-dihydroxy-ethyl)-4,5-dihydroxy-tetrahydro-pyran-2-carbonyloxymethyl] ester