(4S)-4,11-diethyl-4-hydroxy-3,14-dioxo-3,4,12,14-tetrahydro-1H-pyrano[3',4':6,7]indolizino[1,2-b]quinolin-9-yl 1,4'-bipiperidine-1'-carboxylate
(4s)-4,11-diethyl-4-hydroxy-3,14-dioxo-3,4,12,14-tetrahydro-1h-pyrano[3',4':6,7]indolizino[1,2-b]quinolin-9-yl 1,4'-bipiperidine-1'-carboxylate