¹H NMR (400 MHz, CDCl₃) δ 8.64 (s, 1H), 7.40 (dd, J = 7.3, 5.5 Hz, 2H), 7.16 (t, J = 8.4, J = 8.1, Hz, 2H); ¹³C NMR (101 MHz, CDCl₃) δ 163.4 (d, J = 250.4 Hz), 162.2 (s), 160.0 (s), 131.0 (d, J = 8.5 Hz), 120.5 (d, J = 3.5 Hz), 116.3 (s), 116.0 (s); ¹⁹F NMR (376 MHz, CDCl₃) δ -110.8 (s, 1F). HRMS (EI): calculated for C₉H₅N₂O₃F: 208.0284; found: 208.0286.