¹H NMR (400 MHz, CDCl₃) δ 7.44 (s, 1H), 7.35-7.22 (m, 3H), 6.70 (dd, J = 17.5, 10.9 Hz, 1H), 5.80 (d, J = 17.6 Hz, 1H), 5.35 (d, J = 10.8 Hz, 1H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 139.4, 135.6, 134.5, 129.7, 127.7, 126.1, 124.4, 115.3。