¹H NMR (400 MHz, CDCl₃) δ 8.12 (d, J = 8.5 Hz, 2H), 7.93 (s, 1H), 7.84 (d, J = 7.7 Hz, 1H), 7.78 (d, J = 8.6 Hz, 1H), 7.74 (d, J = 8.1 Hz, 1H), 7.64 (t, J = 7.6 Hz, 1H), 7.44 (t, J = 7.5 Hz, 1H), 7.33 (t, J = 7.6 Hz, 1H), 7.18 (d, J = 9.4 Hz, 1H), 2.40 (s, 3H).   ¹³C NMR (100 MHz, CDCl₃) δ 156.5, 147.2, 138.5, 137.5, 135.7, 129.1, 128.6, 127.7, 127.3, 126.4, 126.2, 125.2, 123.7, 121.8, 118.1, 20.6.