InChI=1S/C21H18O12/c1-5-2-7-11(14(26)10-8(13(7)25)3-6(22)4-9(10)23)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)