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