熔点： 92.9 - 94.7 ^oC. ¹H NMR (400 MHz, CDCl₃) δ 7.79 (d, J = 7.7 Hz, 2H), 7.55 (t, J = 7.3 Hz, 1H), 7.43 (t, J = 7.5 Hz, 2H), 7.31 (dd, J = 12.6, 7.5 Hz, 4H), 7.21 (t, J = 6.9 Hz, 1H), 6.09 (s, 1H), 2.81 (dd, J = 47.4, 17.5 Hz, 2H), 2.56 – 2.48 (m, 1H), 2.37 (s, 2H), 2.37 – 2.29 (m, 1H), 2.19 (s, 3H). ¹³C NMR (101 MHz, CDCl₃) δ 207.12, 198.48, 141.02, 136.09, 135.51, 132.99, 128.71, 128.66, 128.25, 126.99, 125.00, 121.11, 64.40, 31.54, 28.38, 26.59, 24.23. HRMS (ESI): calcd for C₂₁H₂₁O₂ [M + H]: 305.1542, found: 305.1543.