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