¹H NMR (400 MHz, CDCl₃) δ 7.51-7.43 (m, 3H), 7.45-7.40 (m, 3H), 7.40-7.35 (m, 3H), 7.34-7.29 (m, 1H), 6.58 (d, J = 15.8 Hz, 1H), 6.52-6.43 (m, 1H), 3.66 (d, J = 6.6 Hz, 2H); ¹³C{H} NMR (101 MHz, CDCl₃) δ 140.1, 137.4, 131.0, 129.2, 128.6, 128.4, 127.1, 126.1, 126.1, 39.3。