¹H NMR (700 MHz, CDCl₃) δ 8.52 (d, J = 4.7 Hz, 1H), 8.40 (s, 1H), 8.24 (d, J = 7.8 Hz, 3H), 7.85 (dt, J = 1.7, 7.7 Hz, 1H), 7.42 (ddd, J = 1.1, 4.7, 7.6 Hz, 1H), 7.35 (m, J = 7.7 Hz, 11H), 7.28 (t, J = 7.2 Hz, 1H), 4.67 (d, J = 6.2 Hz, 1H).