1H NMR (400 MHz, CDCl3) δ 7.14 (d, J = 8.1 Hz, 2H), 7.09 (d, J = 8.0 Hz, 2H), 7.02 (d, J = 13.0 Hz, 1H), 5.81 (d, J = 13.0 Hz, 1H), 3.68 (s, 3H), 2.32 (s, 3H). 13C NMR (101 MHz, CDCl3) δ 148.20, 135.23, 133.36, 129.27, 125.00, 104.93, 56.44, 21.01. GC-MS (m/z): 148。