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