1H NMR (400 MHz, CDCl3) δ: 7.83 (d, J = 8.1 Hz, 2H), 7.60 (d, J = 8.1 Hz, 2H), 4.42 – 4.36 (m, 1H), 3.90 – 3.88 (dd, J= 14.7, 7.2 Hz, 1H), 3.78 – 3.76 (dd, J = 14.8, 7.4 Hz, 1H), 3.36 – 3.31 (dd, J = 16.1, 6.3 Hz, 1H), 3.05 – 2.99 (dd, J = 16.2, 6.3 Hz, 1H), 2.22 – 2.15 (dt, J = 12.9, 6.4 Hz, 1H), 1.97 – 1.90 (dt, J = 13.4, 6.9 Hz, 2H), 1.57 – 1.52 (dd, J = 14.2, 6.2 Hz, 1H). 13C NMR (100 MHz, CDCl3) δ: 25.6 31.6, 44.6, 67.9, 75.3, 128.3, 129.7, 131.9, 135.8, 197.5.
