. . . . "8-Hydroxykynurenic acid" . . "Xanthurenic acid" . . . "Xanthurenate" . . "Xanthurenic acid" . . . . "Xanthuric acid" . "xanthurenic acid" . . . . . "4,8-Dihydroxyquinoline-2-carboxylic acid" . "4,8-Dihydroxyquinaldic acid" .