1677-28-7 2(1H)-Quinolinone, 4-hydroxy- 2,4-Dihydroxyquinoline 2,4-Quinolinediol 4-Hydroxy-2-quinolinone 4-Hydroxy-2-quinolone 4-Hydroxycarbostyril 4-Hydroxyquinolin-2(1H)-one 86-95-3 CARBOSTYRIL, 4-HYDROXY- EINECS 201-711-0 Hydroxycarbostyril NSC 12465 Quinoline-2,4-diol