InChI=1S/C21H20F2N2O/c22-16-8-9-18(23)17(11-16)15-10-19(13-4-2-1-3-5-13)25(12-15)21(26)20(24)14-6-7-14/h1-5,8-11,14,19-20H,6-7,12,24H2/t19-,20-/m0/s1