diethyl 2-(cyclopenten-1-yl)-2-hydroxypropanedioate

diethyl 2,2,3,3-tetracyanocyclopropane-1,1-dicarboxylate

diethyl 2-hydroxy-2-(2,4,6-trifluorophenyl)propanedioate

ethyl 3-methylsulfanyl-6-oxo-1H-1,2,4-triazine-5-carboxylate

甲酸乙酯5-羟基-3-（甲硫基）-1,2,4-三嗪-6-羧酸