InChI=1S/C21H20O10/c22-8-1-3-11-13(5-8)28-7-12-10-4-2-9(6-14(10)30-18(11)12)29-21-17(25)15(23)16(24)19(31-21)20(26)27/h1-6,12,15-19,21-25H,7H2,(H,26,27)