¹H NMR (400 MHz, CDCl₃) δ 7.18 (d, J = 5.0 Hz, 1H), 7.06 – 7.01 (m, 1H), 6.98 – 6.92 (m, 1H), 5.56 (s, 1H), 5.06 (s, 1H), 3.57 (d, J = 5.4 Hz, 2H), 2.65 (s, 2H), 1.88 – 1.79 (m, 6H). ¹³C NMR (101 MHz, CDCl₃) δ 175.60, 143.79, 141.02, 127.44, 125.41, 124.77, 110.16, 52.15, 37.49, 29.98, 28.87, 23.37. HRMS (EI): calcd for C₁₂H₁₅NOS: 221.0874, found: 221.0872。