¹H NMR (400 MHz, CDCl₃) δ 8.58 (d, J = 7.7 Hz, 2H), 7.75 (d, J = 7.6 Hz, 2H), 7.64 (t, J = 7.3 Hz, 1H), 7.51 (dt, J = 22.8, 7.4 Hz, 4H), 7.38 (t, J = 7.1 Hz, 1H), 3.00 (t, J = 7.6 Hz, 2H), 1.94-1.79 (m, 2H), 1.05 (t, J = 7.3 Hz, 3H). ¹³C{¹H} NMR (101 MHz, CDCl₃) δ 178.62, 155.67, 151.95, 137.12, 135.29, 133.66, 131.35, 130.95, 128.71, 128.36, 128.06, 127.12, 28.13, 21.39, 13.87. HRMS (ESI) (M+H)⁺ Calcd. for C₁₉H₁₇NO₂: 292.1333, Found: 292.1331.