1,2,3,4-Tetrahydro-6,7-dimethoxyisoquinoline 1745-07-9 2328-12-3 5-21-04-00478 (Beilstein Handbook Reference) BRN 0158809 Heliamine ISOQUINOLINE, 1,2,3,4-TETRAHYDRO-6,7-DIMETHOXY-