1H-indene-1,3(2H)-dione, 2-(2-oxo-2-phenylethyl)- 2-(2-oxo-2-phenylethyl)-1H-indene-1,3(2H)-dione InChI=1/C17H12O3/c18-15(11-6-2-1-3-7-11)10-14-16(19)12-8-4-5-9-13(12)17(14)20/h1-9,14H,10H