InChI=1S/C21H20O13/c22-8-5-9(33-18-10(8)11(23)12(24)13(25)15(18)27)6-1-3-7(4-2-6)32-21-17(29)14(26)16(28)19(34-21)20(30)31/h1-4,9,14,16-17,19,21,23-29H,5H2,(H,30,31)