1H NMR (400 MHz, CDCl3) δ 7.73 (d, J = 7.9 Hz, 2H), 7.43 (d, J = 8.0 Hz, 2H), 5.92 (s, 1H), 5.64 (s, 1H), 3.52 (s, 2H), 2.12 (s, 3H); 13C NMR (100 MHz, CDCl3) δ 195.7, 143.7, 138.9, 135.7, 130.9, 128.6, 125.8, 35.3, 15.6. HRMS (EI): calcd for C11H11ClOS: 226.0219; found: 226.0213.