InChI=1S/C21H26O11/c1-21(2,28)7-6-10-11(29-3)8-12-9(4-5-13(22)30-12)17(10)31-20-16(25)14(23)15(24)18(32-20)19(26)27/h4-5,8,14-16,18,20,23-25,28H,6-7H2,1-3H3,(H,26,27)