InChI=1S/C21H18O12/c1-5-2-6-7(3-8(5)22)13(25)11-9(23)4-10(24)18(12(11)14(6)26)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)