1-(4-Bromophenyl)-4-methyl-2-oxo-1,2-dihydropyridine-3-carboxylic acid
4-Methyl-2-oxo-1-phenyl-1,2-dihydropyridine-3-carboxylic acid
7-Oxo-6,7-dihydro-5h-cyclopenta[b]pyridine-3-carbonitrile
7-Hydroxy-6,7-dihydro-5h-cyclopenta[b]pyridine-3-carbonitrile