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