InChI=1S/C21H19O11/c22-9-3-1-2-8(4-9)18-12(24)7-11-13(30-18)5-10(23)6-14(11)31-21-17(27)15(25)16(26)19(32-21)20(28)29/h1-7,15-17,19,21-27H,(H,28,29)