¹H NMR (700 MHz, CDCl₃) δ 8.27 (s, 1H), 8.22 (q, J = 3.3 Hz, 4H), 7.69 (td, J = 7.9, 1.9 Hz, 2H), 7.36 (dd, J = 4.9, 3.0 Hz, 2H), 7.20 (d, J = 1.8 Hz, 2H), 7.06 (dd, J = 1.3, 4.9 Hz, 2H), 7.02 (dd, J = 0.9, 4.9 Hz, 2H), 7.01 (d, J = 5.0 Hz, 2H), 3.78 (s, 4H).