¹H NMR (400 MHz, CDCl₃) δ 7.81 (d, J = 8.6 Hz, 2H), 7.58 (d, J = 8.6 Hz, 2H), 2.96 (q, J = 7.2 Hz, 2H), 1.21 (t, J = 7.2 Hz, 3H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 199.6, 135.6, 131.8, 129.5, 127.9, 31.7, 8.1。