¹H NMR (400 MHz, CDCl₃) δ 7.76-7.70 (m, 2H), 7.68-7.59 (m, 5H), 7.47 (d, J = 7.9 Hz, 2H), 5.79 (dd, J = 12.3, 1.4 Hz, 2H), 2.70 (s, 3H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 149.9, 141.6, 138.5, 137.2, 128.8, 128.2, 128.1, 128.0, 127.5, 113.4, 21.0。