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