¹H NMR (400 MHz, CDCl₃) δ 8.39 (d, J = 4.4 Hz, 1H), 7.99 (s, 1H), 7.88 (d, J = 7.6 Hz, 1H), 7.45 – 7.28 (m, 10H), 7.20 – 7.12 (m, 1H), 6.71 (d, J = 3.2 Hz, 1H), 6.31 (d, J = 3.6 Hz, 1H). ¹³C NMR (101 MHz, CDCl₃) δ 147.98, 143.19, 141.08, 138.64, 130.33, 129.83, 128.94, 128.80, 128.22, 127.85, 127.54, 127.33, 126.97, 120.41, 120.01, 117.11, 101.80. HRMS (EI): calcd for C₂₁H₁₆N₂: 296.1313, found: 296.1310。