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