“…1 H NMR (400 MHz, CDCl 3 ) δ (ppm) 5.92–5.79 (m, 3H, OCH 2 C H CH 2 ), 5.37 (s, 1H, H-1), 5.26–5.12 (m, 6H, OCH 2 CHC H 2 ), 4.51 (m, 1H, H-5), 4.08–4.02 (m, 6H, OC H 2 CHCH 2 ), 3.85 (dd, J = 7.1, 0.8 Hz, 1H, H-6), 3.64 (dd, J = 6.8, 6.0 Hz, 1H, H-6), 3.45 (m, 1H, H-3), 3.24 (m, 1H, H-4), 3.21 (m, 1H, H-2). The analyses are in good agreement with the experimental data reported in literature [ 21 ].…”