¹H NMR (400 MHz, CDCl₃) δ 8.80 (d, J = 2.2 Hz, 2H), 8.02 (s, 1H), 7.54 (d, J = 8.2 Hz, 4H), 7.31 (d, J = 7.8 Hz, 4H), 2.43 (s, 6H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 146.5, 138.0, 136.4, 134.9, 132.4, 129.8, 127.0, 21.1。