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