2H,5H-pyrano[3,2-c][1]benzopyran-5-one, 3-(4-bromobenzoyl)-3,4-dihydro-9-methyl- 3-(4-bromobenzoyl)-9-methyl-3,4-dihydro-2H,5H-pyrano[3,2-c]chromen-5-one InChI=1/C20H15BrO4/c1-11-2-7-17-15(8-11)19-16(20(23)25-17)9-13(10-24-19)18(22)12-3-5-14(21)6-4-12/h2-8,13H,9-10H2,1H