4-氧代丁酸乙基酯

ethyl 2-(4-chloro-2-methylpyrimidin-5-yl)acetate

diethyl 2-(diethoxymethyl)butanedioate

2-(二乙氧基甲基)-3-甲酰基丁二酸二乙基酯

ethyl 1-(2-ethoxy-2-oxoethyl)-4-oxocyclohex-2-ene-1-carboxylate