InChI=1S/C20H28O8/c1-9-5-11-6-12(7-21)13(10(2)15(11)16(9)23)3-4-27-20-19(26)18(25)17(24)14(8-22)28-20/h6,9,14,17-22,24-26H,3-5,7-8H2,1-2H3