¹H NMR (400 MHz, CDCl₃) δ 8.80 (s, 2H), 7.97 (t, J = 2.1 Hz, 1H), 7.64 (d, J = 8.5 Hz, 4H), 7.50 (d, J = 8.5 Hz, 4H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 147.0, 136.4, 135.7, 132.5, 132.3, 128.8, 122.8。