2-{4-[3-(5-ethyl-1-methyl-7-oxo-3-propyl-1,7-dihydro-pyrazolo[4,3-d]pyrimidin-6-yl)-propyl]-phenoxy}-2-methyl-propionic acid   、                                                                                      
DL-精氨酸                                                                                                                                                                                              以
                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                    反应 20.0h,
                                                                                                                以96%的产率得到argenine salt of 2-{4-[3-(5-ethyl-1-methyl-7-oxo-3-propyl-1,7-dihydro-pyrazolo[4,3-d]pyrimidin-6-yl)-propyl]-phenoxy}-2-methyl-propionic acid