¹H NMR (400 MHz, CDCl₃) δ 7.53 (s, 1H), 7.48 – 7.34 (m, 3H), 6.91 (d, J = 15.6 Hz, 0.90 ´ 1H), 6.44 (d, J = 10.8 Hz, 0.10 ´ 1H), 6.35 (d, J = 10.8 Hz, 0.10 ´ 1H), 6.30 (d, J = 15.6 Hz, 0.90 ´ 1H), 2.44 (s, 0.10 ´ 3H), 2.40 (s, 0.90 ´ 3H). ¹³C NMR (101 MHz, CDCl₃) δ 137.83, 137.56, 131.47, 131.38, 131.17, 130.85, 130.53, 129.04, 128.63, 128.33, 128.31, 128.30, 125.46, 125.20 (q, J = 3.8 Hz), 123.70, 123.00 (q, J = 3.8 Hz), 122.77, 121.95 (q, J = 3.8 Hz), 18.81, 14.66. HRMS (EI): calcd for C₁₀H₉F₃S: 218.0377, found: 218.0376。