¹H NMR (400 MHz, CDCl₃) δ 7.89 (d, J = 7.9 Hz, 1H), 7.48 (t, J = 7.8 Hz, 1H), 7.02 (t, J = 7.5 Hz, 1H), 6.98 (d, J = 8.4 Hz, 1H), 4.66 (dd, J = 11.5, 4.3 Hz, 1H), 4.50–4.44 (m, 1H), 3.04 (dd, J = 13.6, 4.0 Hz, 1H), 2.89 (ddd, J = 13.5, 9.0, 4.2 Hz, 1H), 2.66 (dd, J = 13.5, 10.0 Hz, 1H), 2.16 (s, 3H); ¹³C NMR (100 MHz, CDCl₃) δ 192.8, 161.6, 136.1, 127.4, 121.5, 120.4, 117.8, 69.4, 45.4, 30.8, 16.2. HRMS (EI): calcd for C₁₁H₁₂O₂S: 208.0558; found: 208.5553.