1H NMR (400 MHz, CDCl3): δ 7.67 (t, J = 7.7 Hz, 2H), 7.52 (d, J = 7.3 Hz, 2H), 7.36 (ddd, J = 26.3, 15.5, 7.6 Hz, 4H), 7.22 (s, 1H), 2.34 (s, 3H). 13C NMR (100 MHz, CDCl3): δ 182.4, 155.4, 150.8, 139.1, 133.4, 133.4, 132.3, 131.7, 131.3, 130.1, 129.4, 127.1, 127.1, 123.6, 123.4, 120.9, 120.0, 18.1. HRMS (EI): calcd for C18H12Br2O2S: 449.8925; found, 449.8922.