1H NMR (400 MHz, CDCl3) δ 7.73 (s, 1H), 7.63 (d, J = 7.7 Hz, 1H), 7.53 (d, J = 7.9 Hz, 1H), 7.40 (t, J = 7.8 Hz, 1H), 5.95 (s, 1H), 5.68 (s, 1H), 3.52 (s, 2H), 2.13 (s, 3H); 13C NMR (100 MHz, CDCl3) δ 195.4, 143.5, 139.1, 134.5, 132.4, 129.6, 129.4, 127.5, 126.5, 35.1, 15.5. HRMS (EI): calcd for C11H11ClOS: 226.0219; found: 226.0216.