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