N-{2-(4,4-ethylenedioxypiperidino)-1-[p-(5-isoquinolinesulfonyloxy)benzyl]ethyl}-N-methyl-5-isoquinolinesulfonamide 、
碘甲烷 、
potassium carbonate 、
盐酸 、 tetrahydrofuran N,N-dimethylformamide 以to obtain N-{1-(p-methoxybenzyl)2-(4-oxopiperidino)ethyl}-N-methyl-5-isoquinolinesulfonamide in a colorless amorphous form的产率得到N-{1-(p-methoxybenzyl)-2-(4-oxopiperidino)ethyl}-N-methyl-5-isoquinolinesulfonamide