InChI=1S/C21H20O11/c22-11-7-10(31-21-18(28)16(26)17(27)19(32-21)20(29)30)8-12(23)14(11)15(25)13(24)6-9-4-2-1-3-5-9/h1-5,7-8,16-19,21-23,26-28H,6H2,(H,29,30)