¹H NMR (400 MHz, CDCl₃) δ 7.27 (s, 2H), 7.12 (td, J = 4.6, 1.9 Hz, 1H), 6.74 (dd, J = 17.6, 10.9 Hz, 1H), 5.79 (dd, J = 17.6, 1.0 Hz, 1H), 5.27 (d, J = 10.8 Hz, 1H), 2.40 (s, 3H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 138.0, 137.5, 136.9, 128.5, 128.4, 126.9, 123.3, 113.5, 21.3。