1204-75-7 2-Quinoxalinecarboxylic acid, 3,4-dihydro-3-oxo- (9CI) 2-Quinoxalinecarboxylic acid, 3-hydroxy- (8CI) 3-Hydroxy-2-quinoxalinecarboxylic acid 3-Hydroxyquinoxaline-2-carboxylic acid EINECS 214-877-4 NSC 34263