InChI=1S/C21H22O8/c22-14(11-12-7-3-1-4-8-12)18(13-9-5-2-6-10-13)28-21-17(25)15(23)16(24)19(29-21)20(26)27/h1-10,15-19,21,23-25H,11H2,(H,26,27)