1H NMR (400 MHz, CDCl3): δ 8.21 (s, 1H), 8.04 (s, 1H), 7.62 (d, J = 8.9 Hz, 1H), 7.42 (d, J = 8.9 Hz, 1H), 2.41 (s, 3H). 13C NMR (100 MHz, CDCl3): δ 174.5, 154.6, 153.7, 134.0, 131.4, 125.4, 124.0, 122.2, 119.8, 16.1. HRMS (EI): calcd for C10H7ClO2S: 225.9855; found, 225.9857.