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