4'-ethyl-1',4',7',8'-tetrahydro-4'-hydroxy-3'H,10'H-spiro[1,3-dioxolane-2,6'-pyrano[3,4-f]indolizine]-3',10'-dione

乙醚

ethyl 2-acetoxy-2-[6-(acetoxymethyl)-1,1-(ethylenedioxy)-5-oxo-1,2,3,5-tetrahydroindolizin-7-yl]butanoate

6-cyano-1,1-(ethylenedioxy)-7-[(ethoxycarbonyl)methyl]-5-oxo-Δ6(8)-tetrahydroindolizine

ethyl bromo-[6-cyano-1,1-(ethylenedioxy)-5-oxo-1,2,3,5-tetrahydroindolizin-7-yl] acetate