InChI=1S/C21H18O12/c22-5-6-1-8-12(10(23)2-6)15(26)13-9(14(8)25)3-7(4-11(13)24)32-21-18(29)16(27)17(28)19(33-21)20(30)31/h1-4,16-19,21-24,27-29H,5H2,(H,30,31)