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