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