1H NMR (400 MHz, CDCl3) δ 7.37 (d, J = 7.8 Hz, 2H), 7.19 (d, J = 7.7 Hz, 2H), 6.89 (t, J = 9.5 Hz, 4H), 6.37 (s, 1H), 3.85 (s, 6H), 3.78 (s, 3H). 13C NMR (101 MHz, CDCl3) δ 158.40, 158.07, 144.75, 133.09, 130.81, 130.34, 129.35, 119.65, 113.64, 113.33, 60.31, 55.23, 55.15. GC-MS (m/z): 270。