InChI=1S/C20H20O11/c1-8(21)3-4-9-7-10-5-6-11(22)29-16(10)18(15(9)28-2)31-20-14(25)12(23)13(24)17(30-20)19(26)27/h3-7,12-14,17,20,23-25H,1-2H3,(H,26,27)