1HNMR (CDCl3) δ 1.13 (t, J = 7.2 Hz, 3 H), 1.30 (t, J = 7.5 Hz, 3 H), 2.65 (q, J = 7.2 Hz, 2 H), 2.70 (t, J = 5.2 Hz, 2 H), 2.76 (q, J = 7.5 Hz, 2 H), 3.46 (dt, J = 5.2, 6.4 Hz, 2 H), 3.63 (s, 2 H), 4.22 (d, J = 6.0 Hz, 2 H), 4.80 (t, J = 6.3 Hz, 1 H), 6.66 (br, 1 H), 7.24–7.40 (m, 9 H), 7.60 (d, J = 7.2 Hz, 2 H), 7.83 (d, J = 8.5 Hz, 2 H);