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