InChI=1S/C21H18O11/c1-6-2-8-13(15(25)12-9(14(8)24)4-7(22)5-10(12)23)11(3-6)31-21-18(28)16(26)17(27)19(32-21)20(29)30/h2-5,16-19,21-23,26-28H,1H3,(H,29,30)