InChI=1S/C20H34O9/c1-13(11-9-7-5-3-2-4-6-8-10-12-14(21)22)28-20-17(25)15(23)16(24)18(29-20)19(26)27/h4,6,13,15-18,20,23-25H,2-3,5,7-12H2,1H3,(H,21,22)(H,26,27)/b6-4-