¹H NMR (400 MHz, CDCl₃) δ 9.68 (s, 1H), 7.30 (td, J = 8.1, 1.6 Hz, 1H), 7.15 (dd, J = 7.4, 1.3 Hz, 1H), 6.99 – 6.89 (m, 2H), 3.82 (s, 3H), 3.65 (d, J = 2.1 Hz, 2H). ¹³C NMR (101 MHz, CDCl₃) δ 200.10, 157.55, 131.16, 128.87, 121.17, 120.72, 110.42, 55.27, 45.33. GC-MS (m/z): 150。