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