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

phenyl isocyanate

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

2-氨基苯甲醛

5'(R)-1,5-dioxo-5'-ethyl-5'-hydroxy-2'H,5'H,6'H-6'-oxopyrano[3',4'-f]Δ6,8-tetrahydroindolizine