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