6,7-dimethoxy-3,4-dihydroisoquinoline;hydrochloride; 3,4-Dihydro-6,7-dimethoxyisoquinolinehydrochloride; 6,7-Dimethoxy-3,4-dihydro isoquinoline Hydrochloride; 6,7-Dimethyl isoquinoline, 6,7-dimethoxy-3,4-dihydroisoquinoline hydrochloride