2(1H)-Quinolinone, 4-hydroxy- 2,4-Dihydroxyquinoline 2,4-Quinolinediol 4-Hydroxy-2-quinolinone 4-Hydroxy-2-quinolone 4-Hydroxycarbostyril 86-95-3 Carbostyril, 4-hydroxy- NSC13962