¹H NMR (400 MHz, CDCl₃) δ 7.90-7.65 (m, 2H), 7.38-7.29 (m, 2H), 2.98 (q, J = 7.2 Hz, 2H), 2.40 (s, 3H), 1.21 (t, J = 7.3 Hz, 3H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 201.0, 138.2, 136.9, 133.5, 128.4, 128.3, 125.1, 31.7, 21.3, 8.2。