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