¹H NMR (400 MHz, CDCl₃) δ 8.86 (s, 1H), 8.30 (d, J = 5.4 Hz, 1H), 7.47 (dd, J = 5.4, 0.9 Hz, 1H), 7.41 – 7.34 (m, 6H), 7.33 – 7.27 (m, 3H), 7.19 – 7.10 (m, 2H), 6.83 (d, J = 3.3 Hz, 1H), 6.36 (d, J = 3.3 Hz, 1H). ¹³C NMR (101 MHz, CDCl₃) δ 140.31, 139.71, 137.87, 134.57, 133.33, 133.30, 132.79, 130.85, 129.90, 128.85, 128.47, 128.12, 128.10, 127.87, 120.32, 115.29, 102.89. HRMS (EI): calcd for C₂₁H₁₆N₂: 296.1313, found: 296.1317。