(S)-3-{4-[Bis-(2-nitro-benzyloxy)-phosphoryloxy]-phenyl}-2-(3,4-dimethoxy-2-nitro-benzyloxycarbonylamino)-propionic acid cyanomethyl ester   、                                                                                      phosphoro-2′-deoxycytidylyl[3′→5′]adenosine tris(tetrabutylammonium) salt                                                                                                                                                                                              以
                                                                                         
N,N-二甲基甲酰胺                                                                                  为溶剂,
                                                                                                                                                                                        以77%的产率得到N{[(2-nitroveratryl)oxy]carbonyl}-O-[bis[(2-nitrobenzyl)oxy]phosphoryl]-(S)-tyrosine pdCpA ester