2-Quinolinecarboxylic acid, 4-hydroxy- 4-Hydroxyquinaldic acid 4-Hydroxyquinaldinic acid 4-Hydroxyquinoline-2-carboxylic acid 492-27-3 KYNURENIC ACID Kinurenic acid Kynuronic acid NSC58973 Quinaldic acid, 4-hydroxy- Quinurenic acid