1H NMR (400 MHz, CDCl3) δ 8.30 – 8.22 (m, 2H), 7.57 (t, J = 7.4 Hz, 1H), 7.51 – 7.45 (m, 3H), 7.28 – 7.24 (m, 3H), 7.22 – 7.16 (m, 4H), 7.13 (d, J = 8.3 Hz, 2H), 2.39 (s, 3H). 13C{1H} NMR (101 MHz, CDCl3) δ 183.0, 144.3, 138.6, 138.4, 137.2, 134.5, 132.8, 130.8, 129.7, 128.9, 128.6, 128.5, 128.4, 128.2, 128.1, 127.2, 21.2.