1H NMR (400 MHz, CDCl3) δ 7.95 (d, J = 7.9 Hz, 2H), 7.56 – 7.60 (m, 1H), 7.45 – 7.49 (m, 2H), 4.28 – 4.22 (m, 1H), 3.93 – 3.89 (m, 1H), 3.80 – 3.71 (m, 3H), 3.66 – 3.60 (m, 1H), 3.37 – 3.41 (m, 1H), 3.23 – 3.22 (dd, J = 16.5, 6.5 Hz, 1H), 2.92 – 2.86 (dd, J = 16.5, 6.0 Hz, 1H). 13C NMR (100 MHz, CDCl3) δ: 40.7, 66.4, 66.8, 70.9, 71.8, 128.2, 128.6, 133.3, 136.8, 197.1.