1H NMR (400 MHz, CDCl3) δ 8.43 – 8.11 (m, 4H), 7.61 (t, J = 7.4 Hz, 1H), 7.54 – 7.46 (m, 3H), 7.40 (d, J = 8.9 Hz, 2H), 7.36 – 7.26 (m, 3H), 7.12 (dd, J = 7.9, 1.6 Hz, 2H). 13C{1H} NMR (101 MHz, CDCl3) δ 182.7, 147.4, 144.1, 142.9, 138.5, 136.5, 133.3, 130.8, 129.7, 128.9, 128.8, 128.7, 128.3, 127.6, 124.4.