3-(2-propyl-2H-tetrazol-5-yl)-9-methyl-4-oxo-4H-pyrido[1,2-a]pyrimidine   、                                                                                      
盐酸                                                                                                                                                                                              以
                                                                                         
乙醇                                                                                  为溶剂,
                                                                                                                                                                                        以1.50 g (89.29%) of the title compound were obtained in the form of white crystals, m.p.: 198°-199° C.的产率得到3-(2-propyl-2H-tetrazol-5-yl)-9-methyl-4-oxo-4H-pyrido[1,2-a]pyrimidine hydrochloride salt