¹H NMR (400 MHz, CDCl₃) δ 7.82 (t, J = 9.4 Hz, 3H), 7.72 (s, 1H), 7.62 (dd, J = 8.6, 1.7 Hz, 1H), 7.54-7.43 (m, 2H), 6.63 (d, J = 15.6 Hz, 1H), 6.52-6.33 (m, 1H), 2.00 (d, J = 6.6 Hz, 3H); ¹³C{H} NMR (101 MHz, CDCl₃) δ 135.4, 133.7, 132.6, 131.2, 128.0, 127.8, 127.6, 126.1, 126.1, 125.4, 125.1, 123.5, 18.6。