¹H NMR (400 MHz, CDCl₃) δ 9.74 (d, J = 2.0 Hz, 1H), 7.27 (t, J = 7.5 Hz, 1H), 7.13 (d, J = 7.6 Hz, 1H), 7.03 (d, J = 8.4 Hz, 2H), 3.65 (d, J = 1.9 Hz, 2H), 2.36 (s, 3H). ¹³C NMR (101 MHz, CDCl₃) δ 199.52, 138.70, 131.67, 130.33, 128.86, 128.12, 126.59, 50.50, 21.29. GC-MS (m/z): 134。