¹H NMR (400 MHz, CDCl₃) δ 8.74 (s, 1H), 7.74 (d, J = 7.8 Hz, 2H), 7.56 (d, J = 7.8 Hz, 2H); ¹³C NMR (101 MHz, CDCl₃) δ 160.6 (s), 131.6 (q, J = 32.9 Hz), 130.4 (s), 129.5 (s), 128.3 (s), 125.9 (q, J = 3.7 Hz), 123.6 (q, J = 272.4 Hz), 115.8 (s). HRMS (EI): calculated for C₁₀H₅N₂O₃F₃: 258.0252; found: 258.0253.