InChI=1S/C20H34O9/c1-2-3-4-5-6-7-8-9-10-13(11-12-14(21)22)28-20-17(25)15(23)16(24)18(29-20)19(26)27/h9-10,13,15-18,20,23-25H,2-8,11-12H2,1H3,(H,21,22)(H,26,27)/b10-9+