.6 Hz, 1H), 3.76 (dd, J = 11.5 Hz, J = 2.8 Hz, 1H), 3.71–3.60 (m, 5H), 2.77 (dd, J = 13.5 Hz, J = 6.9 Hz, 1H), 2.74–2.69 (m, 2H), 2.64 (dd, J = 13.5 Hz, J = 6.8 Hz, 1H), 2.51–2.44 (m, 2H), 2.32–2.18 (m, 2H), 1.69–1