COMEt O CHO COMEt COOEt OHC b CO2 daCoiT、 COoT O COOT OHC COOT COoT COOEt COMEt COOT COmEt COME COMEt Etooc 成设计特殊的二基团切2021/2/23 药物合成设计 特殊的二基团切断 7 COOEt O MeI COOEt O CHO OHC O COOEt OHC O H2 O -CO2 COOEt COOEt O O COOEt COOEt COOEt COOEt O O COOEt COOEt O O COOEt EtOOC O O O O O O COOEt O O O O COOEt a b c d