InChI=1S/C20H26O11/c1-9(8-21)2-4-11-6-10(7-12(22)18(26)27)3-5-13(11)30-20-16(25)14(23)15(24)17(31-20)19(28)29/h2-3,5-6,12,14-17,20-25H,4,7-8H2,1H3,(H,26,27)(H,28,29)