2,2-dimethyl-3-(toluene-4-sulfonyloxy)-butyric acid methyl ester

ethyl 2,2-dimethylbut-3-enoate

ethyl 2,2-dimethyl-3-(4-toluenesulfonyloxy)butanoate

2,2-二甲基-3-氧代丁酸乙酯

乙酸乙酯