InChI=1S/C20H34O9/c21-13-11-9-7-5-3-1-2-4-6-8-10-12-14(22)28-20-17(25)15(23)16(24)18(29-20)19(26)27/h4,6,15-18,20-21,23-25H,1-3,5,7-13H2,(H,26,27)/b6-4+