¹H NMR (400 MHz, CDCl₃) δ 8.08 (s, 1H), 7.9-7.79 (m, 1H), 7.67 (ddd, J = 8.0, 2.0, 1.0 Hz, 1H), 7.33 (t, J = 7.8 Hz, 1H), 2.97 (q, J = 7.2 Hz, 2H), 1.22 (t, J = 7.2 Hz, 3H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 199.3, 138.6, 135.7, 131.0, 130.1, 126.5, 122.9, 31.9, 8.1。