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