InChI=1S/C21H20O11/c1-29-14-5-8-4-13(10-3-2-9(22)6-11(10)23)30-12(8)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)