1H NMR (400 MHz, CDCl3) δ 7.28 (s, 4H), 6.35 (d, J = 14.5 Hz, 1H), 6.31-6.22 (m, 1H), 2.25 (tt, J = 8.6, 6.7 Hz, 2H), 1.12 (t, J = 7.4 Hz, 3H); 13C{H} NMR (101 MHz, CDCl3) δ 136.4, 133.3, 132.2, 128.5, 127.6, 127.1, 26.0, 13.5。