InChI=1S/C20H32O9/c1-2-3-6-9-12-13(27-12)10-7-4-5-8-11-14(21)28-20-17(24)15(22)16(23)18(29-20)19(25)26/h4,7,12-13,15-18,20,22-24H,2-3,5-6,8-11H2,1H3,(H,25,26)/b7-4-