20353-55-3 5,6-Dihydro-8,9-dimethoxypyrrolo(2,1-a)isoquinoline-2,3-dicarboxylic acid 5-22-05-00598 (Beilstein Handbook Reference) BRN 0497399 Pyrrolo(2,1-a)isoquinoline-2,3-dicarboxylic acid, 5,6-dihydro-8,9-dimethoxy-