¹H NMR (400 MHz, CDCl₃) δ: 7.76 (d, J = 9.9 Hz, 2H), 7.38 – 7.32 (m, 2H), 4.44 – 4.37 (m, 1H), 3.90 – 3.88 (dd, J = 14.8, 7.1 Hz, 1H), 3.78 – 3.74 (dd, J = 14.9, 7.4 Hz, 1H), 3.41 – 3.36 (dd, J = 16.2, 6.0 Hz, 1H), 3.07 – 3.01 (dd, J = 16.2, 6.8 Hz, 1H), 2.41 (s, 3H), 2.22 – 2.17 (dt, J = 12.6, 6.4 Hz, 1H), 1.97 – 1.90 (m, 2H), 1.61 – 1.52 (ddd, J = 16.1, 12.4, 7.9 Hz, 1H). ¹³C NMR (100 MHz, CDCl₃) δ: 21.3, 25.6, 31.6, 44.7, 67.8, 75.4, 125.4, 128.4, 128.7, 133.8, 137.1, 138.3, 198.6.