1-(3-Chlorophenyl)-2-oxo-1,2-dihydropyridine-3-carboxylic acid
1-(3-Fluoro-phenyl)-2-oxo-1,2-dihydro-pyridine-3-carboxylic acid
1-(2-Chlorophenyl)-2-oxo-1,2-dihydropyridine-3-carboxylic acid
1-(2-Fluoro-phenyl)-2-oxo-1,2-dihydro-pyridine-3-carboxylic acid