121064-20-8 3,4-Dihydro-6,7-dimethoxy-1,2,3,3-tetramethylisoquinolinium iodide 6,7-Dimethoxy-1,2,3,3-tetramethyl-3,4-dihydroisoquinolinium iodide Isoquinolinium, 3,4-dihydro-6,7-dimethoxy-1,2,3,3-tetramethyl-, iodide