¹H NMR (400 MHz, CDCl₃) δ 6.80 (s, 3H), 5.02 (s, 1H), 3.93 (s, 2H), 3.85 (d, J = 10.2 Hz, 8H), 2.89 (d, J = 2.5 Hz, 2H). ¹³C NMR (101 MHz, CDCl₃) δ 148.62, 147.68, 128.59, 121.55, 112.80, 111.06, 104.64, 64.86, 55.74, 55.71, 40.21. HRMS (EI): calcd for C₁₃H₁₅F₃S: 260.0847, found: 260.0844。