1986-00-1 2-Hydroxy-9-fluorenone 4-08-00-01384 (Beilstein Handbook Reference) 4-Hydroxy-9-fluorenone 9H-Fluoren-9-one, 4-hydroxy- (9CI) BRN 2096590 FLUOREN-9-ONE, 4-HYDROXY- NSC 49683