¹H NMR (400 MHz, CDCl₃) δ 8.66 (s, 1H), 7.51 (d, J = 7.7 Hz, 1H), 7.45 – 7.40 (m, 1H), 7.37 (d, J = 2.4 Hz, 2H); ¹³C NMR (101 MHz, CDCl₃) δ 161.0 (s), 134.0 (s), 131,3 (s), 131.1 (s), 129.9 (s), 127.1 (s), 124.0 (s), 114.1 (s). HRMS (EI): calculated for C₉H₅N₂O₃Cl: 223.9982; found: 223.9982.