¹H NMR (400 MHz, CDCl₃) δ 7.34 (s, 1H), 6.31 (s, 1H), 6.16 (d, J = 2.9 Hz, 1H), 5.12 (t, J = 4.8 Hz, 1H), 4.02 – 3.93 (m, 2H), 3.92 – 3.83 (m, 2H), 3.00 (d, J = 4.8 Hz, 2H). ¹³C NMR (101 MHz, CDCl₃) δ 150.43, 141.61, 110.32, 107.24, 102.66, 65.05, 33.50. HRMS (EI): calcd for C₈H₁₀O₃: 154.0630, found: 154.0633。