SEARCH Articles Figures Tables 1,1 ,3,3 -Tetrahydro- -2,2 dione 1.2.3.4- Tetrahydro-isoquinoline 4- pyrimido 6.7- Dimethoxy-4 isoquinoline 9.10- Dimethoxy-2,3,6,7-tetrahydro-4//pyrimido isoquinoline-2,4-dione Isoquinolines tetrahydro Pyrimido isoquinolines