InChI=1S/C21H22O9/c1-27-11-4-2-10(3-5-11)16-8-14(23)18-13(22)6-12(7-17(18)30-16)29-21-20(26)19(25)15(24)9-28-21/h2-7,15-16,19-22,24-26H,8-9H2,1H3