InChI=1S/C21H22O9/c22-15-16(23)18(19(25)26)30-21(17(15)24)29-14(12-7-3-1-4-8-12)11-28-20(27)13-9-5-2-6-10-13/h1-10,14-18,21-24H,11H2,(H,25,26)