1H NMR (400 MHz, CDCl3) δ7.39-7.33 (m, 2H), 7.33-7.22 (m, 7H), 6.44 (d, J = 16.0 Hz, 1H), 6.41-6.32 (m, 1H), 3.58 (d, J = 6.1 Hz, 2H); 13C{H} NMR (101 MHz, CDCl3) δ 139.8, 136.0, 132.6, 130.0, 129.8, 128.6, 128.6, 128.5, 127.3, 126.3, 39.3。