¹H NMR (400 MHz, CDCl₃) δ 7.85-7.78 (m, 3H), 7.65 (dd, J = 8.6, 1.7 Hz, 1H), 7.52-7.40 (m, 2H), 6.90 (dd, J = 17.6, 10.9 Hz, 1H), 5.88 (d, J = 17.6 Hz, 1H), 5.35 (d, J = 10.8 Hz, 1H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 136.9, 135.0, 133.5, 133.1, 128.1, 128.0, 127.6, 126.3, 126.2, 125.9, 123.2, 114.2。