3a-ethyl-2,3,3a,4,5,7-hexahydroindolizino[8,1-ef][1]benzazonine-1,6-dione InChI=1/C19H20N2O2/c1-2-19-10-7-16(22)20-15-6-4-3-5-13(15)14-9-12-21(18(14)19)17(23)8-11-19/h3-6,9,12H,2,7-8,10-11H2,1H3,(H,20,22 indolizino[8,1-ef][1]benzazonine-1,6-dione, 3a-ethyl-2,3,3a,4,5,7-hexahydro-