InChI=1S/C21H20O10/c1-28-14-8-13-10(6-12(29-13)9-3-2-4-11(22)5-9)7-15(14)30-21-18(25)16(23)17(24)19(31-21)20(26)27/h2-8,16-19,21-25H,1H3,(H,26,27)