1H NMR (400 MHz, CDCl3) δ 7.59 – 7.53 (dd, J = 17.4, 7.8 Hz, 3H), 7.43 – 7.39 (m, 7H), 7.11 (d, J = 7.8 Hz, 1H), 7.04 (d, J = 7.05 Hz, 1H), 6.91 – 6.88 (m, 1H), 3.93 (d, J = 14.5 Hz, 1H), 3.73 (d, J = 14.5 Hz, 1H), 2.71 (s, 3H), 1.45 (s, 3H); 13C NMR (100 MHz, CDCl3) δ: 25.4, 30.5, 44.7, 46.5, 120.7, 121.5, 125.5, 127.5, 128.0, 128.5, 130.0, 130.8, 133.1, 134.8, 136.4, 139.2, 140.8, 181.7, 196.2; HRMS (EI) m/z calcd for C24H21NO2 [M+]: 355.1572; found 355.1565.