2398-81-4 3-Carboxypyridine N-oxide 3-Pyridinecarboxylic acid oxide 3-Pyridinecarboxylic acid, 1-oxide N-Hydroxynicotinic acid NSC93890 Nicotinic acid 1-oxide Nicotinic acid N-oxide Nicotinic acid oxide Nicotinic acid, 1-oxide Nicotinic acid, 1-oxide, N-oxide Oxiniacic acid Pyridine-3-carboxylic acid N-oxide