InChI=1S/C21H16O13/c22-4-5-1-6-10(8(23)2-5)14(26)11-7(12(6)24)3-9(13(25)15(11)27)33-21-18(30)16(28)17(29)19(34-21)20(31)32/h1-4,16-19,21,23,25,27-30H,(H,31,32)