1H NMR (400 MHz, CDCl3): 1H NMR (400 MHz, CDCl3) δ 8.14 (d, J = 8.2 Hz, 1H), 8.02 (s, 1H), 7.24 (d, J = 5.6 Hz, 2H), 2.50 (s, 3H), 2.41 (s, 3H). 13C NMR (100 MHz, CDCl3): δ 175.5, 156.4, 153.7, 145.2, 127.0, 125.8, 121.6, 121.0, 117.7, 21.8, 16.3. HRMS (EI): calcd for C11H10O2S: 206.0402; found, 206.0404.