ethyl 2-[3-(2-ethoxy-2-oxoethyl)-5-fluoro-2,4-dioxopyrimidin-1-yl]acetate

ethyl 2-(2-acetyl-4-methylphenoxy)acetate

ethyl 3-(N-ethylanilino)-3-oxopropanoate

(1-羟基-4-氧代-2,5-环己二烯-1-基)乙酸乙酯

(S)-3-羟基-3-(2-噻吩基)丙酸乙酯