1H NMR (400 MHz, CDCl3) δ 0.91 (t, 3 H, J = 7.0 Hz), 1.11 (d, 6 H, J = 7.0 Hz), 1.82 (h, 2 H, J = 7.0 Hz), 2.40 (quint, 1 H, J = 6.9 Hz), 4.14 (t, 2 H, J = 7.1 Hz).