InChI=1S/C21H20O13/c22-8-4-10(24)13-12(5-8)34-21(31,18(13)28)6-7-1-2-9(23)11(3-7)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)