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