(S)-3-Methylthio-1,5,10,10a-tetrahydrothiazolo[3,4-b]isoquinolinium iodide 、
8-amino-3-methylisoquinoline 以(S)-3-[(3-methylisoquinol-8-yl)imino]-1,5,10,10a-tetrahydrothiazolo[3,4-b]isoquinoline (4.1 g) is obtained in the form of pale yellow crystals, m.p.=156° C.的产率得到(S)-3-[(3-methylisoquinol-8-yl)imino]-1,5,10,10a-tetrahydrothiazolo[3,4-b]isoquinoline