4-ethyl-1,12-dihydro-14H-pyrano[3',4':6,7indolizino[1,2-b]]quinolin-14-one

ethyl 3-(3-allyl-1H-pyrrolo[3,4-b]quinolin-2(3H)-yl)-3-oxopropanoate

ethyl 7-methyl-9-oxo-9,11-dihydroindolizino[1,2-b]quinoline-8-carboxylate

ethyl 7-(2-ethoxy-2-oxoethyl)-9-oxo-9,11-dihydroindolizino[1,2-b]quinoline-8-carboxylate

1-benzyl 3-ethyl 5-allyl-4-oxopyrrolidine-1,3-dicarboxylate