6-chloro-4-iodo-2-(ethoxymethoxy)-3-hydroxymethylpyridine

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

ethyl (S)-2-[N-tosyl-(R)-prolyloxy]-2-[6-cyano-1,1-(ethylenedioxy)-5-oxo-1,2,3,5-tetrahydroindolizin-7-yl]butanoate