1H NMR (400 MHz, CDCl3) δ 7.61 (d, J = 15.7 Hz, 1H), 7.53–7.49 (m, 2H), 7.35–7.30 (m, 3H), 7.22 – 7.16 (m, 1H), 6.05 (s, 1H), 5.82 (s, 1H), 3.39 (s, 2H), 1.99 (s, 3H); 13C NMR (100 MHz, CDCl3) δ 190.7, 145.2, 144.3, 134.8, 130.5, 128.9, 128.4, 124.3, 121.6, 34.5, 15.4. HRMS (EI): calcd for C13H14OS: 218.0765; found: 218.0760.