¹H NMR (400 MHz, CDCl₃) δ 7.49 (d, J = 7.7 Hz, 1H), 7.33 (d, J = 7.8 Hz, 1H), 7.20 (td, J = 7.5, 1.4 Hz, 1H), 7.13 (t, J= 7.6 Hz, 1H), 6.79 (d, J = 15.7 Hz, 1H), 6.29-6.19 (m, 1H), 1.94 (d, J = 6.7 Hz, 3H); ¹³C{H} NMR (101 MHz, CDCl₃) δ 136.0, 132.4, 129.5, 128.7, 127.8, 127.3, 126.7, 126.6, 18.7。