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