1-(2-Fluoro-phenyl)-2-oxo-1,2-dihydro-pyridine-3-carboxylic acid
1-(4-Chloro-phenyl)-2-oxo-1,2-dihydro-pyridine-3-carboxylic acid
2-Oxo-1-(p-tolyl)-1,2-dihydropyridine-3-carboxylic acid
2-Oxo-1-m-tolyl-1,2-dihydro-pyridine-3-carboxylic acid
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