InChI=1S/C21H18O12/c1-5-4-6-9(14(26)11-8(23)3-2-7(22)10(11)13(6)25)18(12(5)24)32-21-17(29)15(27)16(28)19(33-21)20(30)31/h2-4,15-17,19,21-24,27-29H,1H3,(H,30,31)