InChI=1S/C21H28O9/c1-2-3-10-14(18-13(28-18)11-8-6-4-5-7-9-12-22)29-21-17(25)15(23)16(24)19(30-21)20(26)27/h1,12-19,21,23-25H,4-9,11H2,(H,26,27)