diethyl 2-pyridin-2-ylpropanedioate

diethyl 2-(pyridin-4-yl)malonate

diethyl 2-[(2,6-difluorophenyl)methyl]propanedioate

二乙基(3-硝基苯胺亚甲基)丙二酸

2-(2-(苄氧基)乙基)丙二酸二乙酯