英文别名
                        (R)-((S)-2-(6'-(acetoxymethyl)-5'-oxo-3',5'-dihydro-2'H-spiro[[1,3]dioxolane-2,1'-indolizine]-7'-yl)-1-ethoxy-1-oxobutan-2-yl) 1-tosylpyrrolidine-2-carboxylate;ethyl (S)-2--2-<6-(acetoxymethyl)-1,1-(ethylenedioxy)-5-oxo-1,2,3,5-tetrahydroindolizin-7-yl>butanoate;Ethyl (S)-6-(acetoxymethyl)-α-ethyl-1,1-(ethylenedioxy)-α-[(R)-1-(p-toluenesulfoyl)-pyrrolidin-2-ylcarbonyloxy]-5-oxo-1,2,3,5-tetrahydroindolizine-7-acetate;ethyl (S)-2-(N-tosyl-(R)-prolyloxy)-2-[6-(acetoxymethyl)-1,1-(ethylenedioxy)-5-oxo-1,2,3,5-tetrahydroindolizin-7-yl]butanoate;(S)-2-(6-(Acetoxymethyl)-5-oxo-2,3-dihydro-5H-spiro[indolizine-1,2'-[1,3]dioxolan]-7-YL)-1-ethoxy-1-oxobutan-2-YL tosyl-D-prolinate;[(2S)-2-[6'-(acetyloxymethyl)-5'-oxospiro[1,3-dioxolane-2,1'-2,3-dihydroindolizine]-7'-yl]-1-ethoxy-1-oxobutan-2-yl] (2R)-1-(4-methylphenyl)sulfonylpyrrolidine-2-carboxylate