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