3-acetyl-7,12-dihydro-6H-indolo[2,3-a]quinolizin-4-one

3-ethyl-3-(phenylsulfinyl)-1,2,3,6,7,12b-hexahydroindolo[2,3-a]quinolizin-4(12H)-one

ethyl 2-ethyl-4-formylbutyrate ethylene acetal

diethyl 2-[2-(1,3-dioxolan-2-yl)ethyl]-2-ethylpropanedioate

diethyl 2-ethyl-2-(3-oxopropyl)propanedioate