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