1H NMR (400 MHz, CDCl3) δ: 7.90 (d, J = 7.9 Hz, 2H), 7.48 – 7.52 (m, 1H), 7.38 – 7.42 (m, 2H), 5.36 – 5.40 (m, 1H), 3.96 – 3.88 (m, 2H), 3.85 – 3.82 (m, 2H), 3.28 (d, J = 4.9 Hz, 2H). 13C NMR (100 MHz, CDCl3) δ: 43.4, 65.0, 101.4, 128.3, 128.6, 133.3, 136.9, 196.5.