Isobutyric acid (2R,3R,4R,5R)-2-[8-(4-dimethylamino-phenyl)-2-isobutyrylamino-6-oxo-1,6-dihydro-purin-9-yl]-4-isobutyryloxy-5-isobutyryloxymethyl-tetrahydro-furan-3-yl ester                                                                                                                                                              在
                                                                                                                                                                                 
4-二甲氨基吡啶   、                                                                                                  
三乙胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲醇   、                                                                                         
二氯甲烷   、                                                                                         
乙腈                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 Isobutyric acid (2R,3R,4R,5R)-2-[2-amino-8-(4-dimethylamino-phenyl)-6-oxo-1,6-dihydro-purin-9-yl]-4-isobutyryloxy-5-isobutyryloxymethyl-tetrahydro-furan-3-yl ester