1H NMR (400 MHz, CDCl3) δ 7.87 (d, J = 7.6 Hz, 2H), 7.67 (d, J = 7.7 Hz, 2H), 7.63 (d, J = 7.9 Hz, 2H), 7.47 (t, J = 7.5 Hz, 2H), 7.40 (t, J = 7.3 Hz, 1H), 5.93 (s, 1H), 5.72 (s, 1H), 3.57 (s, 2H), 2.15 (s, 3H); 13C NMR (100 MHz, CDCl3) δ 196.6, 145.3, 143.9, 139.9, 136.1, 130.2, 129.0, 128.2, 127.3, 127.0, 125.5, 35.4, 15.5. HRMS (EI): calcd for C17H16OS: 268.0922; found: 268.0914.