¹H NMR (400 MHz, CDCl₃) δ 7.90-7.77 (m, 4H), 7.68 (dd, J = 8.6, 1.9 Hz, 1H), 7.53-7.40 (m, 2H), 5.54 (s, 1H), 5.21 (t, 1H), 2.28 (t, J = 1.0 Hz, 3H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 143.0, 138.3, 133.4, 132.8, 128.2, 127.7, 127.5, 126.1, 125.8, 124.2, 123.9, 113.0, 21.9。