¹H NMR (400 MHz, CDCl₃) δ 8.09-7.68 (m, 2H), 7.22 (d, J = 7.9 Hz, 2H), 2.94 (q, J = 7.2 Hz, 2H), 2.38 (s, 3H), 1.20 (t, J = 7.3 Hz, 3H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 200.3, 143.4, 134.4, 129.1, 128.0, 31.5, 21.4, 8.2。