¹H NMR (400 MHz, CDCl₃) δ 7.36 (d, J = 7.6 Hz, 2H), 6.87 (d, J = 6.8 Hz, 2H), 6.68 (dd, J = 17.6, 10.8 Hz, 1H), 5.62 (d, J = 17.5 Hz, 1H), 5.14 (d, J = 10.9 Hz, 1H), 3.82 (s, 3H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 159.4, 136.2, 130.5, 127.4, 113.9, 111.5, 55.3。