(2S,4S)-Ethyl 1-(2-((tert-butoxycarbonyl)amino)ethyl)-4-(2-isobutyramido-6-oxo-3H-purin-9(6H)-yl)pyrrolidine-2-carboxylate                                                                                                                                                              在
                                                                                                                                                                                 
sodium hydroxide                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                                                        以64%的产率得到(2S,4S)-1-(2-((tert-Butoxycarbonyl)amino)ethyl)-4-(2-isobutyramido-6-oxo-3H-purin-9(6H)-yl)pyrrolidine-2-carboxylic acid