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