¹H NMR (400 MHz, CDCl₃) δ 7.56 (d, J = 1.5 Hz, 1H), 7.49 (s, 1H), 7.21 (d, J = 8.1 Hz, 4H), 7.12 (dd, J = 14.2, 8.1 Hz, 4H), 6.89 (d, J = 2.5 Hz, 1H), 6.14 – 6.04 (m, 1H), 2.41 (s, 3H), 2.37 (s, 3H). ¹³C NMR (101 MHz, CDCl₃) δ 139.78, 137.80, 137.59, 137.47, 134.94, 131.12, 129.70, 129.67, 129.11, 129.06, 127.26, 124.64, 106.29, 21.26, 21.06. GC-MS (m/z): 274。