InChI=1S/C21H20O9/c22-15-12-7-6-11(9-13(12)29-14(15)8-10-4-2-1-3-5-10)28-21-18(25)16(23)17(24)19(30-21)20(26)27/h1-7,9,14,16-19,21,23-25H,8H2,(H,26,27)