1H), 5.89 (d, J = 2.5 Hz, 1H), 5.77 (d, J = 3.3 Hz, 1H), 4.51–4.47 (m, 2H), 4.36 (dd, J = 5.1 Hz, J = 3.4 Hz, 1H), 4.34–4.29 (m, 1H), 4.14–4.08 (m, 2H), 3.97 (td, J = 10.6 Hz, J = 2.4 Hz, 1H), 3.89–3