1H NMR (400 MHz, CDCl3) δ 8.33 – 8.23 (m, 2H), 7.60 – 7.53 (m, 2H), 7.48 (t, J = 7.5 Hz, 2H), 7.29 – 7.23 (m, 3H), 7.22 – 7.16 (m, 2H), 7.14 – 7.04 (m, 3H), 2.37 (s, 3H), 1.94 (s, 3H). 13C{1H} NMR (101 MHz, CDCl3) δ 182.8, 144.2, 138.9, 138.0, 137.1, 134.7, 134.0, 132.7, 131.5, 130.8, 129.0, 128.6, 128.4, 128.3, 128.0, 128.0, 127.5, 127.3, 21.2, 17.4. HRMS (EI) m/z: calcd for C24H20N2O, 352.1576; found, 352.1578.