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