1H NMR (400 MHz, CDCl3) δ 7.67 (d, J = 15.7 Hz, 1H), 7.48 (d, J = 7.7 Hz, 2H), 7.25–7.18 (m, 3H), 6.11 (s, 1H), 5.88 (s, 1H), 3.47 (s, 2H), 2.38 (s, 3H), 2.07 (s, 3H); 13C NMR (100 MHz, CDCl3) δ 190.8, 145.3, 144.4, 141.0, 132.0, 129.7, 128.4, 124.0, 120.7, 34.5, 21.5, 15.4. HRMS (EI): calcd for C14H16OS: 232.0922; found: 232.0917.