¹H NMR (400 MHz, CDCl₃) δ 8.84 (s, 2H), 8.07 (s, 1H), 7.65 (d, J = 7.5 Hz, 2H), 7.60 (d, J = 8.2 Hz, 2H), 7.52 (dd, J = 14.6, 7.6 Hz, 4H), 7.44 (t, J = 7.3 Hz, 1H), 1.39 (s, 9H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 151.5, 146.5, 146.3, 137.7, 134.6, 133.0, 129.1, 128.2, 127.2, 126. 9, 126.1, 34.6, 31.3. HRMS (EI) m/z: [M]⁺ Calcd for C₂₁H₂₁N: 287.1674; Found: 287.1673。