¹H NMR (400 MHz, CDCl₃) δ 7.79 – 7.74 (m, 1H), 7.46 (s, 2H), 7.39 (s, 5H), 7.31 (d, J = 4.0 Hz, 5H), 7.23 (s, 1H), 7.15 (d, J = 4.0 Hz, 2H). ¹³C NMR (101 MHz, CDCl₃) δ 142.76, 142.12, 139.88, 137.46, 137.36, 133.72, 129.58, 129.16, 128.58, 128.53, 128.50, 127.95, 123.61, 122.93, 120.34, 118.17, 109.91. HRMS (EI): calcd for C₂₁H₁₆N₂: 296.1313, found: 296.1314。