¹H NMR (400 MHz, CDCl₃) δ: 7.74 – 7.71 (dd, J = 7.2, 3.8 Hz, 1H), 7.64 (d, J = 4.9 Hz, 1H), 7.11 – 7.15 (m, 1H), 4.42 – 4.35 (m, 1H), 3.90 – 3.87 (dd, J = 14.5, 7.2 Hz, 1H), 3.76 – 3.74 (dd, J = 14.8, 7.5 Hz, 1H), 3.33 – 3.27 (dd, J = 15.4, 6.3 Hz, 1H), 3.01 – 2.96 (dd, J = 15.2, 6.5 Hz, 1H), 2.17 (dt, J = 12.5, 6.5 Hz, 1H), 1.93 (dt, J = 10.3, 8.5 Hz, 2H), 1.84 – 1.75 (m, 1H). ¹³C NMR (100 MHz, CDCl₃) δ: 25.6, 31.5, 45.4, 67.9, 75.5, 128.1, 132.3, 133.8, 144.6, 191.1. HRMS (EI) Calcd for C₁₀H₁₂O₂S (M⁺) 196.0558; Found, 196.0563.