¹H NMR (400 MHz, CDCl₃) δ 7.40-7.34 (m, 2H), 7.32-7.27 (m, 4H), 7.24 (dd, J = 5.0, 1.3 Hz, 1H), 7.14 (d, J = 4.1 Hz, 1H), 6.52 (d, J = 17.3 Hz, 1H), 6.35-6.20 (m, 1H), 3.58 (d, J = 6.9 Hz, 2H); ¹³C{H} NMR (101 MHz, CDCl₃) δ 140.1, 140.0, 129.2, 128.6, 128.5, 126.1, 125.8, 125.3, 125.0, 121.0, 39.2。