¹H NMR (400 MHz, CDCl₃) δ: 7.90 (d, J = 8.2 Hz, 2H), 7.43 (d, J = 8.2 Hz, 2H), 4.42 – 4.35 (m, 1H), 3.90 – 3.88 (dd, J= 14.6, 7.3 Hz, 1H), 3.78 –3.74 (dd, J = 14.9, 7.4 Hz, 1H), 3.37 – 3.31 (dd, J = 16.2, 6.3 Hz, 1H), 3.03 – 2.99 (dd, J = 16.2, 6.3 Hz, 1H), 2.22 – 2.15 (td, J = 12.8, 6.5 Hz, 1H), 1.98 – 1.88 (m, 2H), 1.61 – 1.52 (dq, J = 12.5, 8.0 Hz, 1H). ¹³C NMR (100 MHz, CDCl₃) δ: 25.5 31.5, 44.5, 67.8, 75.3, 128.8, 129.6, 135.3, 139.5, 197.2.