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