1H NMR (400 MHz, CDCl3) δ 8.82 (s, 1H), 8.62 (d, J = 3.2 Hz, 1H), 7.86 (d, J = 8.2 Hz, 1H), 7.53 (d, J = 7.4 Hz, 4H), 7.47 – 7.35 (m, 7H). 13C{1H} NMR (101 MHz, CDCl3) δ 169.0, 148.4, 146.9, 136.6, 133.1, 130.2, 130.0, 128.7, 128.1, 123.7. HRMS (EI) m/z: calcd for C21H14N2O2, 326.1055; found, 326.1057.