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