¹H NMR (400 MHz, CDCl₃) δ 7.52 (s, 1H), 7.47 – 7.38 (m, 3H), 7.35 – 7.24 (m, 7H), 6.52 (s, 1H), 2.23 (s, 3H), 1.84 (s, 3H). ¹³C NMR (101 MHz, CDCl₃) δ 148.54, 140.43, 138.11, 129.89, 128.92, 128.19, 127.76, 127.61, 127.34, 127.09, 126.85, 125.49, 115.56, 11.32, 8.21. HRMS (EI): calcd for C₁₉H₁₈N₂: 274.1470, found: 274.1475。