110714-43-7
ethyl bromo-[6-cyano-1,1-(ethylenedioxy)-5-oxo-1,2,3,5-tetrahydroindolizin-7-yl] acetate
→
110742-81-9
ethyl (S)-2-[N-tosyl-(R)-prolyloxy]-2-[6-cyano-1,1-(ethylenedioxy)-5-oxo-1,2,3,5-tetrahydroindolizin-7-yl]butanoate