(S)-4-ethyl-4-hydroxy-8-methoxy-1H-pyrano[3,4-c]pyridin-3(4H)-one

(S)-4,11-diethyl-4-hydroxy-9-methoxy-1H-pyrano[3',4':6,7]-indolizino[1,2-b]quinoline-3,14(4H,12H)-dione