¹H NMR (400 MHz, CDCl₃) δ 8.03 (s, 1H), 7.67 (d, J = 8.0 Hz, 1H), 7.44 (s, 1H), 7.39 (s, 5H), 7.24 – 6.99 (m, 8H). ¹³C NMR (101 MHz, CDCl₃) δ 140.79, 138.89, 138.40, 136.67, 135.42, 129.91, 128.54, 128.34, 128.14, 128.12, 127.62, 126.55, 124.11, 122.48, 121.32, 120.79, 110.29. HRMS (EI): calcd for C₂₁H₁₆N₂: 296.1313, found: 296.1310。