InChI=1S/C21H18O11/c1-6-2-8-12(10(23)3-6)15(25)13-9(14(8)24)4-7(22)5-11(13)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)