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