1H-indene-1,3(2H)-dione, 2-methyl-2-[2-(4-nitrophenyl)-2-oxoethyl]- 2-methyl-2-[2-(4-nitrophenyl)-2-oxoethyl]-1H-indene-1,3(2H)-dione InChI=1/C18H13NO5/c1-18(16(21)13-4-2-3-5-14(13)17(18)22)10-15(20)11-6-8-12(9-7-11)19(23)24/h2-9H,10H2,1H