1H NMR (400 MHz, CDCl3) δ 7.54 (d, J = 7.5 Hz, 4H), 7.44 – 7.35 (m, 7H), 7.30 – 7.25 (m, 2H), 7.21 (d, J = 7.5 Hz, 1H), 2.43 (s, 3H). 13C{1H} NMR (101 MHz, CDCl3) δ 169.6, 139.0, 136.2, 131.6, 130.0, 129.9, 128.8, 128.6, 128.6, 128.5, 126.9, 123.3, 21.4.