InChI=1S/C20H22O9/c21-8-20(26)9-27-19(18(20)25)28-12-5-14(23)13-7-15(24)17(29-16(13)6-12)10-1-3-11(22)4-2-10/h1-6,15,17-19,21-26H,7-9H2