5-Hydroxy-2-nitro-fluoren-9-one 5-hydroxy-2-nitro-9H-fluoren-9-one 9H-fluoren-9-one, 5-hydroxy-2-nitro- InChI=1/C13H7NO4/c15-11-3-1-2-9-12(11)8-5-4-7(14(17)18)6-10(8)13(9)16/h1-6,15