InChI=1S/C20H32O9/c1-13(21)11-9-7-5-3-2-4-6-8-10-12-14(22)28-20-17(25)15(23)16(24)18(29-20)19(26)27/h3-6,13,15-18,20-21,23-25H,2,7-12H2,1H3,(H,26,27)/b5-3-,6-4-