¹H NMR (400 MHz, CDCl₃) δ 8.86 (s, 1H); ¹³C NMR (101 MHz, CDCl₃) δ 162.5 (s), 145.9 – 143.1 (m), 143.8 – 140.9 (m), 139.4 – 139.1 (m), 136.9 – 136.5 (m), 102.1 (s), 100.7 (td, J = 17.3, 4.3 Hz); ¹⁹F NMR (376 MHz, CDCl₃) δ -138.0 – -138.8 (m, 2F), -149.82 (dd, J = 23.8, 21.5 Hz, 1F), -160.00 (ddd, J = 25.8, 11.1, 4.8 Hz, 2F). HRMS (EI): calculated for C₉HN₂O₃F₅: 279.9907; found: 279.9906.