¹H NMR (400 MHz, CDCl₃) δ: 7.54 (d, J = 7.6 Hz, 1H), 7.49 (s, 1H), 7.35 – 7.39 (m, 1H), 7.12 – 7.09 (dd, J = 8.2, 2.4 Hz, 1H), 4.44 – 4.37 (m, 1H), 3.90 – 3.85 (m, 4H), 3.76 – 3.74 (dd, J = 14.9, 7.4 Hz, 1H), 3.40 – 3.35 (dd, J = 16.2, 6.1 Hz, 1H), 3.07 – 3.02 (dd, J = 16.2, 6.7 Hz, 1H), 2.22 – 2.16 (td, J = 12.8, 6.5 Hz, 1H), 1.97 – 1.89 (m, 2H), 1.61 – 1.52 (ddd, J = 16.0, 12.4, 7.9 Hz, 1H). ¹³C NMR (100 MHz, CDCl₃) δ: 25.6, 31.6, 44.7, 55.3, 67.8, 75.4, 112.2, 119.6, 120.8, 129.5, 138.4, 159.8, 198.2. HRMS (EI) Calcd for C₁₃H₁₆O₃ (M⁺) 220.1099; Found, 220.1098.