InChI=1S/C21H20O11/c1-29-13-5-9(22)6-14-15(13)17(27)20(32-21-18(28)16(26)12(25)7-30-21)19(31-14)8-2-3-10(23)11(24)4-8/h2-6,12,16,18,21-26,28H,7H2,1H3