¹H NMR (400 MHz, CDCl₃) δ 8.57 (d, J = 7.8 Hz, 2H), 7.74 (d, J = 7.6 Hz, 2H), 7.65 (t, J = 7.3 Hz, 1H), 7.54 (t, J = 7.4 Hz, 2H), 7.48 (t, J = 7.3 Hz, 2H), 7.38 (t, J = 7.4 Hz, 1H), 3.06 (q, J = 7.4 Hz, 2H), 1.43 (t, J = 7.5 Hz, 3H). ¹³C{¹H} NMR (101 MHz, CDCl₃) δ 178.70, 155.62, 152.94 , 136.60, 135.28, 133.70, 131.31, 130.97, 128.74, 128.39, 128.09, 127.11, 19.79, 12.35. HRMS (ESI) (M+H)⁺ Calcd. for C₁₈H₁₆NO₂: 278.1176, Found: 278.1173