InChI=1S/C21H18O9/c22-11-9-14(10-5-2-1-3-6-10)28-12-7-4-8-13(15(11)12)29-21-18(25)16(23)17(24)19(30-21)20(26)27/h1-9,16-19,21,23-25H,(H,26,27)