¹H NMR (400 MHz, CDCl₃) δ 7.80 (d, J = 8.0 Hz, 2H), 7.40 (dd, J = 13.0, 7.1 Hz, 4H), 7.33 (t, J = 7.5 Hz, 2H), 7.24 (d, J = 8.5 Hz, 1H), 6.18 (s, 1H), 3.58 (d, J = 9.7 Hz, 1H), 2.60 (d, J = 5.0 Hz, 2H), 2.57 – 2.44 (m, 2H), 2.43 (s, 3H), 2.18 (d, J = 12.3 Hz, 1H), 1.89 (dt, J = 29.7, 10.5 Hz, 1H). ¹³C NMR (101 MHz, CDCl₃) δ 203.58, 141.78, 138.54, 136.34 , 133.78, 128.88, 128.59, 128.33, 126.91, 125.56, 125.08, 123.19, 41.33, 28.83, 27.22, 26.29, 21.46. HRMS (ESI): calcd for C₂₀H₂₁O [M + H]: 277.1592, found: 277.1591.