InChI=1S/C20H32O9/c1-2-27-16(23)10-12-7-8-14(22)13(12)6-4-3-5-9-28-20-19(26)18(25)17(24)15(11-21)29-20/h3-4,12-13,15,17-21,24-26H,2,5-11H2,1H3/b4-3+