¹H NMR (400 MHz, CDCl₃) δ 9.55 (t, J = 2.0 Hz, 1H), 6.16 (s, 2H), 3.82 (s, 3H), 3.78 (s, 6H), 3.59 (d, J = 2.0 Hz, 2H). ¹³C NMR (101 MHz, CDCl₃) δ 201.32, 160.71, 159.12, 101.77, 90.45, 55.64, 55.33, 37.83. GC-MS (m/z): 210。