1H NMR (400 MHz, CDCl3): δ 8.04 (d, J = 6.3 Hz, 2H), 7.48 (d, J = 8.5 Hz, 1H), 7.35 (d, J = 8.5 Hz, 1H), 2.46 (s, 3H), 2.40 (s, 3H). 13C NMR (100 MHz, CDCl3): δ 175.74 , 154.59 , 154.06 , 135.53 , 135.08 , 125.35 , 122.89 , 121.48 , 117.85 , 20.97 , 16.41. HRMS (EI): calcd for C11H10O2S: 206.0402; found, 206.0406.