InChI=1S/C21H20O11/c22-10(7-6-9-4-2-1-3-5-9)13-11(23)8-12(24)14(25)18(13)31-21-17(28)15(26)16(27)19(32-21)20(29)30/h1-8,15-17,19,21,23-28H,(H,29,30)