5-amino-3-propylisoquinoline   、                                                                                      
(S)-3-Methylthio-1,5,10,10a-tetrahydrothiazolo[3,4-b]isoquinolinium iodide                                                                                                                                                                                                                                                                                                          以(S)-3-[(3-propylisoquinol-5-yl)imino]-1,5,10,10a-tetrahydrothiazolo[3,4-b]isoquinoline (0.35 g) is obtained in a crude form, which的产率得到(S)-3-[(3-propylisoquinol-5-yl)imino]-1,5,10,10a-tetrahydrothiazolo[3,4-b]isoquinoline