¹H NMR (400 MHz, CDCl₃) δ 7.32 (q, J = 8.6 Hz, 4H), 6.67 (dd, J = 17.6, 10.9 Hz, 1H), 5.73 (d, J = 17.6 Hz, 1H), 5.27 (d, J = 10.9 Hz, 1H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 136.0, 135.7, 133.4, 128.7, 127.4, 114.4。