1H NMR (400 MHz, CDCl3) δ 7.55 (t, J = 8.4 Hz, 2H), 7.47 (t, J = 10.1 Hz, 3H), 7.41-7.33 (m, 3H), 7.23 (s, 1H), 2.35 (s, 3H). 13C NMR (100 MHz, CDCl3): δ 181.6, 154.0, 151.2, 137.1, 133.9, 131.9, 131.8, 131.7, 131.3, 131.1, 130.3, 130.3, 129.4, 128.0, 126.5, 123.4, 121.1, 18.0. HRMS (EI): calcd for C18H12Cl2O2S: 361.9935; found, 361.9931.