乙基2-(2H5)乙基-3-氧代丁酸酯

(3R)-3-羟基-十四烷酸乙酯

ethyl 4-methyl-2-oxocyclohex-3-ene-1-carboxylate

ethyl 6-methyl-4-(5-nitrothiophen-2-yl)-2-oxo-3,4-dihydro-1H-pyrimidine-5-carboxylate

ethyl 2-acetyl-5-chloropentanoate