6-(acetamidomethyl)-1,1-(ethylenedioxy)-7-(1'-(ethoxycarbonyl)propyl)-5-oxo-Δ6(8)-tetrahydroindolizine

ethyl 2-(6-((N-nitrosoacetamido)methyl)-5-oxo-2,3-dihydro-5H-spiro[indolizine-1,2'-[1,3]dioxolan]-7-yl)butanoate

methyl 2-pyrrolidin-2-ylideneacetate

4-ethyl-4-hydroxy-1,7-dihydro-4H-pyrano[3,4-c]pyridine-3,8-dione

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