. . . . "4-Hydroxyquinoline-2-carboxylic acid" . . . . . . . "Kynurenic acid" . . . . . . . . "Kynurenic_acid" . . . . . . . "Kynurenic acid" . . . . . . . . . "Kinurenic acid, kynuronic acid, quinurenic acid, transtorine" . . . . . . "kynurenic acid" .