(R)-2-Acetoxy-bernsteinsaeuredimethylester

dimethyl oxirane-2,3-dicarboxylate

ethyl (3R)-3-(tert-butylsulfanylcarbonyl)-2-hydroxypropanoate

(4R,5R)-2-thioxo-4,5-bis(methoxycarbonyl)-1,3-dioxolane

乙酰氯