¹H NMR (400 MHz, CDCl₃) δ 7.82 (d, J = 8.8 Hz, 1H), 7.06–6.98 (m, 2H), 4.67 (dd, J = 11.5, 4.4 Hz, 1H), 4.48 (dd, J = 10.7, 9.6 Hz, 1H), 3.03 (dd, J = 13.7, 3.8 Hz, 1H), 2.89 (ddd, J = 13.1, 8.9, 4.1 Hz, 1H), 2.70–2.61 (m, 1H), 2.16 (s, 3H); ¹³C NMR (100 MHz, CDCl₃) δ   191.8, 161.9, 141.9, 128.6, 122.4, 119.0, 118.0, 69.8, 45.3, 30.7, 16.2. HRMS (EI): calcd for C₁₁H₁₁ClO₂S: 242.0168; found: 242.0161.