¹H NMR (400 MHz, CDCl₃) δ 7.76 (t, 3H), 7.66 (s, 1H), 7.57 (d, J = 7.9 Hz, 1H), 7.48-7.38 (m, 2H), 6.57 (dd, J = 15.8, 1.8 Hz, 1H), 6.46-6.30 (m, 1H), 1.95 (dd, J = 6.6, 1.6 Hz, 3H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 135.4, 133.7, 132.6, 131.1, 128.0, 127.8, 127.6, 126.2, 126.1, 125.4, 125.1, 123.5, 18.6。