2-hexadecylguanidine;nitric acid   、                                                                                      butyl 1-(2'-deoxy-3',5'-di-O-p-toluoyl-α-D-erythropentofuranosyl)-4,5-imidazoledicarboxylate                                                                                                                                                              在
                                                                                                                                                                                 
sodium methylate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                    反应 0.5h,
                                                                                                                以99%的产率得到4,5-dihydro-8H-6-(N-hexadecyl)amino-1-(2'-deoxy-α-D-erythropentofuranosyl)imidazo[4,5-e]diazepine-4,8-dione