1-(4-Methoxyphenyl)-2-oxo-1,2-dihydropyridine-3-carboxylic acid
1-(3-Methoxyphenyl)-2-oxo-1,2-dihydropyridine-3-carboxylic acid
1-(2-Methoxyphenyl)-2-oxo-1,2-dihydropyridine-3-carboxylic acid
1-(3-Chlorophenyl)-2-oxo-1,2-dihydropyridine-3-carboxylic acid