¹H NMR (700 MHz, CDCl₃) δ 8.53 (d, J = 4.3 Hz, 3H), 8.19 (d, J = 7.8 Hz, 3H), 7.94 (s, 1H), 7.82 (t, J = 7.6 Hz, 3H), 7.40 (dd, J = 5.3, 6.8 Hz, 3H), 3.96 (m, J = 6.6 Hz, 3H), 2.00 (d, J = 9.7 Hz, 5H), 1.76 (td, J = 3.4, 12.8 Hz, 6H), 1.64 (q, J = 4.4 Hz, 3H), 1.42 (m, J = 7.4 Hz, 6H), 1.31 (m, J = 7.4 Hz, 6H), 1.23 (m, J = 9.1 Hz, 3H).