1H NMR (400 MHz, CDCl3) δ: 8.07 (d, J = 8.1 Hz, 2H), 7.73 (d, J = 8.2 Hz, 2H), 4.44 – 4.37 (m, 1H), 3.90 – 3.88 (m, 1H), 3.77 – 3.75 (dd, J = 14.9, 7.4 Hz, 1H), 3.42 – 3.36 (dd, J = 16.2, 6.4 Hz, 1H), 3.11 – 3.05 (dd, J = 16.2, 6.1 Hz, 1H), 2.23 – 2.17 (td, J = 12.8, 6.5 Hz, 1H), 1.98 – 1.91 (m, 2H), 1.63 – 1.54 (ddd, J = 16.0, 12.4, 8.0 Hz, 1H). 13C NMR (100 MHz, CDCl3) δ: 25.6, 31.6, 44.9, 67.9, 75.2, 122.2, 125.6 (q, JC-F = 3.6 Hz), 128.5, 134.5 (d, JC-F = 33 Hz) 139.7, 197.5.