1H NMR (400 MHz, CDCl3) δ 8.25 (d, J = 7.4 Hz, 2H), 7.58 (t, J = 7.3 Hz, 1H), 7.52 – 7.44 (m, 3H), 7.29 – 7.26 (m, 3H), 7.23 – 7.11 (m, 4H), 6.90 (d, J = 8.8 Hz, 2H), 3.83 (s, 3H). 13C{1H} NMR (101 MHz, CDCl3) δ 183.1, 159.5, 144.3, 138.6, 137.2, 132.8, 130.8, 129.8, 128.8, 128.6, 128.6, 128.5, 128.4, 128.3, 128.1, 114.2, 55.4.