1H NMR (400 MHz, CDCl3) δ 7.86-7.79 (m, 2H), 7.16-7.12 (m, 2H), 5.90 (s, 1H), 5.63 (s, 1H), 3.53 (s, 2H), 2.13 (s, 3H); 13C NMR (100 MHz, CDCl3) δ 195.5, 165.4 (d, J = 254.4 Hz), 143.7, 133.6 (d, J = 3.1 Hz), 132.1 (d, J = 9.2 Hz), 125.3, 115.5 (d, J = 21.9 Hz), 35.4, 15.5. HRMS (EI): calcd for C11H11FOS: 210.0515; found: 210.0511.