¹H NMR (400 MHz, CDCl₃) δ 9.18 (d, J = 1.3 Hz, 1H), 8.20 (s, 1H), 8.07 – 7.97 (m, 2H), 7.78 (d, J = 9.0 Hz, 1H), 7.69 (d, J = 8.0 Hz, 2H), 7.54 (t, J = 7.5 Hz, 2H), 7.46 (t, J = 7.4 Hz, 1H). ¹³C{¹H} NMR (101 MHz, CDCl₃) δ 150.2, 145.7, 137.3, 134.7, 132.8, 132.1, 130.9, 129.9, 129.3, 129.2, 128.4, 127.4, 121.0.