InChI=1S/C21H18O11/c22-10-6-9(30-21-17(27)14(24)16(26)19(32-21)20(28)29)7-11-12(10)13(23)15(25)18(31-11)8-4-2-1-3-5-8/h1-7,14,16-17,19,21-22,24-27H,(H,28,29)