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