¹H NMR (400 MHz, CDCl₃): δ 8.01 (d, J = 2.3 Hz, 1H), 7.67 (s, 1H), 7.50 (s, 2H), 7.25 – 7.18 (m, 3H), 7.03 (d, J = 7.4 Hz, 2H), 6.58 – 6.55 (m, 1H), 6.44 (s, 2H), 5.93 (s, 2H). ¹³C{¹H} NMR (101 MHz, CDCl₃): δ 170.3, 151.5, 147.5, 143.5, 143.1, 142.5, 136.8, 129.7, 129.6, 128.6, 127.4, 126.3, 123.0, 112.4, 111.7, 110.2, 49.7. HRMS (EI) m/z: calcd for C₁₉H₁₄N₂O₃, 318.1004; found, 318.1009.