¹H NMR (400 MHz, CDCl₃) δ 7.55-7.28 (m, 2H), 7.08-6.86 (m, 1H), 2.92 (q, J = 7.2 Hz, 2H), 1.19 (t, J = 7.2 Hz, 3H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 197.9 (d, J = 2.3 Hz), 163.0 (dd, J = 250.6, 11.7 Hz), 139.8 (t, J = 7.3 Hz), 110.8 (d, J = 25.9 Hz), 108.0 (t, J = 25.5 Hz), 31.9, 7.8。