¹H NMR (400 MHz, CDCl₃) δ 8.03 (d, J = 7.4 Hz, 2H), 7.59 (d, J = 7.2 Hz, 1H), 7.51 (t, J = 7.3 Hz, 2H), 7.06 (s, 2H), 6.93 (s, 1H), 6.17 (s, 1H), 3.62 (s, 1H), 2.61 (s, 2H), 2.59 – 2.47 (m, 2H), 2.35 (s, 6H), 2.17 (d, J = 9.3 Hz, 1H), 1.96 – 1.85 (m, 1H). ¹³C NMR (101 MHz, CDCl₃) δ 203.34 (s), 141.89 (s), 137.71 (s), 136.53 (s), 136.37 (s), 132.98 (s), 128.72 (s), 128.59 (s), 128.36 (s), 123.10 (s), 122.77 (s), 41.40 (s), 28.79 (s), 27.41 (s), 26.35 (s), 21.45 (s). HRMS (EI): called for C₂₁H₂₂O: 290.1671, found: 290.1672.