InChI=1S/C20H22O9/c21-9-14-16(23)17(24)18(25)20(29-14)28-13-8-4-7-12(22)15(13)19(26)27-10-11-5-2-1-3-6-11/h1-8,14,16-18,20-25H,9-10H2