¹H NMR (400 MHz, CDCl₃) δ 9.74 (t, J = 2.1 Hz, 1H), 7.20 (t, J = 6.6 Hz, 2H), 7.15 – 7.09 (m, 2H), 3.66 (d, J = 1.9 Hz, 2H), 2.37 (s, 3H). ¹³C NMR (101 MHz, CDCl₃) δ 199.58, 137.01, 129.62, 129.42, 128.63, 50.10, 20.99. GC-MS (m/z): 134。