SEARCH Articles Figures Tables 1- Methyl-4,5,6,7-tetrahydro 1.2.3.4- Tetrahydro-isoquinoline 5.6- dimethoxy-3- -2-methyl 6.7- Dimethoxy-2-methyl-1,2,3,4-tetrahydro 6.7- Dimethoxy-4 isoquinoline Isoquinolines tetrahydro