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