1H NMR (400 MHz, CDCl3) δ 7.44 (d, J = 7.4 Hz, 2H), 7.39 (t, J = 7.3 Hz, 2H), 7.32 (q, J = 7.9 Hz, 5H), 6.21 (s, 1H), 4.66 (d, J = 9.5 Hz, 1H), 4.63 - 4.46 (m, 2H), 2.74 – 2.58 (m, 2H).13C NMR (100 MHz, CDCl3) δ 142.2, 138.5, 133.4, 133.1, 128.6, 128.5, 127.8, 126.1, 126.0, 122.8, 75.9, 66.8, 34.9.