¹H NMR (400 MHz, CDCl₃) δ 8.80 (s, 2H), 7.97 (s, 1H), 7.59 (dd, J = 8.5, 5.4 Hz, 4H), 7.19 (t, J = 8.5 Hz, 4H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 163.0 (d, J = 248.3 Hz), 146.4, 135.8, 133.6, 132.8, 128.9 (d, J = 8.2 Hz), 116.2 (d, J = 21.7 Hz)。