1H-indene-1,3(2H)-dione, 2-[2-(4-bromophenyl)-2-oxoethyl]-2-methyl- 2-[2-(4-bromophenyl)-2-oxoethyl]-2-methyl-1H-indene-1,3(2H)-dione InChI=1/C18H13BrO3/c1-18(10-15(20)11-6-8-12(19)9-7-11)16(21)13-4-2-3-5-14(13)17(18)22/h2-9H,10H2,1H