¹H NMR (400 MHz, CDCl₃) δ 8.86 (d, J = 2.9 Hz, 1H), 8.08 (dd, J = 24.2, 8.4 Hz, 2H), 7.72 – 7.61 (m, 2H), 7.37 (dd, J= 8.2, 4.2 Hz, 1H), 5.16 (t, J = 4.6 Hz, 1H), 3.98 – 3.76 (m, 4H), 3.15 (d, J = 4.6 Hz, 2H). ¹³C NMR (101 MHz, CDCl₃) δ 149.77, 147.10, 135.93, 134.66, 131.89, 128.96, 128.16, 128.01, 121.05, 104.23, 65.01, 40.59. HRMS (EI): calcd for C₁₃H₁₃NO₂: 215.0946, found: 215.0950。