¹H NMR (400 MHz, CDCl₃) δ 7.52 (s, 1H), 7.47 – 7.38 (m, 4H), 7.35 – 7.23 (m, 7H), 6.60 (s, 1H), 1.91 (s, 3H). ¹³C NMR (101 MHz, CDCl₃) δ 140.81, 140.31, 137.98, 129.85, 129.12, 128.96, 128.28, 127.94, 127.43, 127.37, 127.12, 125.68, 117.04, 8.71. HRMS (EI): calcd for C₁₈H₁₆N₂: 260.1313, found: 260.1317。