(S)-4-Ethyl-4-hydroxy-6-iodo-3-oxo-7-allyl-1H-pyrano[3,4-c]-8-pyridone

(3R,4S)-4-ethyl-3,4-dihydroxy-1,3,4,12-tetrahydro-14H-pyrano[3',4':6,7]indolizino[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