InChI=1S/C21H18O13/c22-7-3-1-2-6(4-7)17-18(13(26)10-9(32-17)5-8(23)11(24)12(10)25)33-21-16(29)14(27)15(28)19(34-21)20(30)31/h1-5,14-16,19,21-25,27-29H,(H,30,31)