16135-43-6 ISOQUINOLINE, N-METHYL-6,7-DIMETHOXY-1,2,3,4-TETRAHYDRO-, HYDROCHLORIDE Isoquinoline, 1,2,3,4-tetrahydro-6,7-dimethoxy-2-methyl-, hydrochloride (8CI,9CI) N-Methyl-6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline hydrochloride N-Methylheliamine hydrochloride