InChI=1S/C20H34O9/c1-2-3-4-5-7-10-13(21)11-8-6-9-12-14(22)28-20-17(25)15(23)16(24)18(29-20)19(26)27/h8,11,13,15-18,20-21,23-25H,2-7,9-10,12H2,1H3,(H,26,27)/b11-8+