1H NMR (400 MHz, CDCl3): δ 8.29 (d, J = 8.1 Hz, 2H), 7.30 (s, 1H), 7.27 – 7.15 (m, 5H), 6.94 (dd, J = 14.7, 8.0 Hz, 6H), 5.69 (s, 2H), 3.87 (s, 3H), 3.82 (s, 3H). 13C{1H} NMR (101 MHz, CDCl3): δ 182.6, 163.3, 160.2, 143.6, 138.6, 137.9, 133.2, 130.8, 130.4, 128.8, 128.6, 127.2, 126.0, 120.9, 114.2, 113.3, 55.4, 55.3, 49.0. HRMS (EI) m/z: calcd for C25H22N2O3, 398.1630; found, 398.1626.