1-(9H-fluoren-2-yl)ethanone 781-73-7 InChI=1/C15H12O/c1-10(16)11-6-7-15-13(8-11)9-12-4-2-3-5-14(12)15/h2-8H,9H2,1H ethanone, 1-(9H-fluoren-2-yl)-