InChI=1S/C21H18F2N2O/c22-18-8-9-19(23)17(11-18)12-20(24)14-6-4-13(5-7-14)15-2-1-3-16(10-15)21(25)26/h1-11,20H,12,24H2,(H2,25,26)/t20-/m1/s1