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