ethyl 2-(2-ethoxy-2-oxoethyl)-1-methylpyrrole-3-carboxylate

(2,6-二氧代-1,2,3,6-四氢嘧啶-4-基)乙酸乙酯

Ethyl 2-amino-4-(2-ethoxy-2-oxoethyl)-1,3-thiazole-5-carboxylate

ethyl 2-(5-ethoxy-1-phenylpyrazol-3-yl)acetate

diethyl 2-benzyl-3-oxopentanedioate