InChI=1S/C21H20O11/c1-29-17-11(23)6-9-7-12(8-3-2-4-10(22)5-8)30-16(9)19(17)32-21-15(26)13(24)14(25)18(31-21)20(27)28/h2-7,13-15,18,21-26H,1H3,(H,27,28)