¹H NMR (400 MHz, CDCl₃) δ 9.33 (d, J = 8.1 Hz, 1H), 9.28 (d, J = 2.3 Hz, 1H), 8.34 (d, J = 2.3 Hz, 1H), 7.93 (d, J = 7.5 Hz, 1H), 7.85 (d, J = 8.8 Hz, 1H), 7.82 – 7.68 (m, 5H), 7.55 (t, J = 7.6 Hz, 2H), 7.46 (t, J = 7.4 Hz, 1H). ¹³C{¹H} NMR (101 MHz, CDCl₃) δ 147.8, 145.4, 137.9, 134.6, 133.6, 133.5, 131.2, 129.2, 128.3, 128.2, 128.1, 127.8, 127.4, 127.2, 126.2, 125.4, 124.4.