¹H NMR (400 MHz, CDCl₃) δ 7.40 (dd, J = 8.6, 5.5 Hz, 2H), 7.04 (t, J = 8.7 Hz, 2H), 6.71 (dd, J = 17.6, 10.9 Hz, 1H), 5.69 (d, J = 17.5 Hz, 1H), 5.25 (d, J = 10.9 Hz, 1H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 162.5 (d, J = 246.8 Hz), 135.7, 133.7 (d, J = 3.4 Hz), 127.7 (d, J = 8.0 Hz), 115.4 (d, J = 21.6 Hz), 113.5 (d, J = 2.3 Hz)。