1H NMR (CDCl3) δ 1.13 (t, J = 7.2 Hz, 3 H), 2.47 (s, 3 H), 2.64 (q, J = 7.2 Hz, 2 H), 2.69 (t, J = 6.0, 2 H), 3.46 (dt, J = 5.1, 6.0 Hz 2 H), 3.63 (s, 2 H), 4.21 (s, 2 H), 4.84–4.97 (br, 1 H), 6.62–6.69 (br, 1 H), 7.25–7.37 (m, 9 H), 7.59 (d, J = 8.4 Hz, 2 H), 7.81 (d, J =8.4 Hz, 2 H);