¹H NMR (400 MHz, CDCl₃) δ 8.86 (s, 1H), 8.34 (d, J = 4.9 Hz, 1H), 7.46 – 7.26 (m, 10H), 7.14 (dt, J = 3.7, 2.9 Hz, 2H), 6.71 (d, J = 3.4 Hz, 1H), 6.46 (d, J = 3.3 Hz, 1H). ¹³C NMR (101 MHz, CDCl₃) δ 143.27, 141.15, 140.37, 140.29, 137.75, 134.78, 129.93, 128.85, 128.49, 128.22, 128.15, 127.92, 120.20, 105.44, 102.97. HRMS (EI): calcd for C₂₁H₁₆N₂: 296.1313, found: 296.1318。