、 、
1-<(3,4-diethoxyphenyl)methyl>-6,7-diethoxy-3,4-dihydro-2H+-isoquinolinium 1,2,3,6-tetrahydro-7H-1,3-dimethyl-2,6-dioxopurine-7-acetate 、 1-(3',4'-Diethoxy-benzyl)-6,7-diethoxy-3,4-dihydro-isoquinolinium 、
Theophylline-7-acetate 、 以
水 为溶剂,
以the 1-(3',4'-diethoxy-benzyl) 6,7-diethoxy-3,4-dihydro-isoquinolinium-theophylline-7-acetate-monohydrate thus obtained的产率得到1-<(3,4-diethoxyphenyl)methyl>-6,7-diethoxy-3,4-dihydro-2H
+-isoquinolinium 1,2,3,6-tetrahydro-7H-1,3-dimethyl-2,6-dioxopurine-7-acetate monohydrate