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