(S)-α-Ethyl-1,1-(ethylenedioxy)-α-hydroxy-6-(hydroxymethyl)-N-[(R)-1-phenylethyl]-5-oxo-1,2,3,5-tetrahydroindolizine-7-acetamide

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

camtothecin-20-O-methyl carbonate

2-氟烟酸甲酯