¹H NMR (400 MHz, CDCl₃) δ 7.53 (s, 1H), 7.44 – 7.35 (m, 3H), 7.33 – 7.27 (m, 5H), 7.26 – 7.24 (m, 2H), 6.72 (d, J = 2.4 Hz, 1H), 5.87 (d, J = 2.5 Hz, 1H), 2.30 (s, 3H). ¹³C NMR (101 MHz, CDCl₃) δ 149.15, 140.13, 137.94, 129.79, 129.60, 129.17, 128.95, 128.23, 127.86, 127.37, 126.99, 125.31, 106.53, 13.27. HRMS (EI): calcd for C₁₈H₁₆N₂: 260.1313, found: 260.1309。