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