InChI=1S/C21H16O13/c22-5-1-2-6-9(3-5)31-15-7-4-8(23)17(14(27)16(7)32-20(30)10(6)15)33-21-13(26)11(24)12(25)18(34-21)19(28)29/h1-4,11-13,18,21-27H,(H,28,29)