1,6-Dihydro-6-oxo-3-pyridinecarboxylic acid 2-Pyridone-5-carboxylic acid 3-Pyridinecarboxylic acid, 1,6-dihydro-6-oxo- 5006-66-6 6-Hydroxynicotinic acid NSC8620 Nicotinic acid, 1,6-dihydro-6-oxo-