ethyl 7-chloro-2-methyl-4-oxo-1H-quinoline-3-carboxylate

ethyl 2,3-dimethyl-5-oxo-1,2-oxazole-4-carboxylate

diethyl 4-(2-ethoxy-2-oxoethyl)-2,6-dihydroxybenzene-1,3-dicarboxylate

diethyl 2-(3-phenylpropanoyl)propanedioate

ethyl 1-ethyl-4-hydroxy-6-methyl-2H-pyridine-3-carboxylate