¹H NMR (400 MHz, CDCl₃) δ 7.25 (dd, J = 4.7, 1.5 Hz, 1H), 7.10-7.03 (m, 2H), 6.91 (dd, J = 17.4, 10.8 Hz, 1H), 5.67 (d, J = 17.4 Hz, 1H), 5.23 (d, J = 10.8 Hz, 1H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 143.0, 129.8, 127.2, 125.7, 124.3, 113.2。