¹H NMR (400 MHz, CDCl₃) δ 7.39 (d, J = 8.5 Hz, 2H), 7.11 (d, J = 8.5 Hz, 2H), 5.76 (d, J = 13.2 Hz, 1H), 5.80 (d, J = 13.2 Hz, 1H), 3.71 (s, 3H). ¹³C NMR (101 MHz, CDCl₃) δ 149.34, 135.37, 131.59, 126.60, 118.95, 104.03, 56.58. HRMS (EI): calculated for C₉H₁₉BrO: 211.9837; found: 211.9842。