1H NMR (400 MHz, CDCl3) δ 8.68 (s, 1H), 7.47 – 7.38 (m, 3H), 7.29 (d, J = 7.8 Hz, 1H); 13C NMR (101 MHz, CDCl3) δ 160.3 (s), 134.8 (s), 130.2 (s), 129.7 (s), 129.0 (s), 127.2 (s), 126.2 (s), 115.7 (s). HRMS (EI): calculated for C9H5N2O3Cl: 223.9982; found: 223.9984.