1H NMR (400 MHz, CDCl3) δ 7.58 (d, J = 7.5 Hz, 1H), 7.36 (d, J = 6.5 Hz, 2H), 7.31 – 7.16 (m, 9H), 6.88 (s, 2H), 5.58 (s, 2H), 2.33 (s, 3H), 2.07 (s, 3H). 13C{1H} NMR (101 MHz, CDCl3) δ 188.2, 143.6, 138.4, 138.4, 138.1, 137.0, 131.0, 130.9, 130.6, 130.4, 130.0, 129.7, 129.4, 128.4, 127.9, 127.8, 127.5, 126.9, 125.9, 125.0, 48.9, 20.0, 19.9. HRMS (EI) m/z: calcd for C25H22N2O, 366.1732; found, 366.1736.