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