InChI=1S/C21H20O13/c22-8-3-1-7(2-4-8)6-21(31)18(28)11-9(34-21)5-10(12(23)13(11)24)32-20-16(27)14(25)15(26)17(33-20)19(29)30/h1-5,14-17,20,22-27,31H,6H2,(H,29,30)