¹H NMR (400 MHz, CDCl₃) δ 7.43-7.29 (m, 4H), 7.23 (t, J = 7.1 Hz, 1H), 6.45 (dd, J = 15.7, 1.8 Hz, 1H), 6.34-6.22 (m, 1H), 1.92 (dd, J = 6.6, 1.5 Hz, 3H); ¹³C{H} NMR (101 MHz, CDCl₃) δ 137.9, 131.0, 128.4, 126.7, 125.8, 125.6, 18.5。