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