1H NMR (400 MHz, CDCl3) δ 8.26 (d, J = 7.5 Hz, 2H), 7.59 (t, J = 7.3 Hz, 1H), 7.53 – 7.44 (m, 3H), 7.37 (d, J = 8.5 Hz, 2H), 7.33 – 7.26 (m, 3H), 7.23 – 7.11 (m, 4H). 13C{1H} NMR (101 MHz, CDCl3) δ 182.9, 144.2, 138.5, 136.9, 135.8, 134.7, 133.1, 130.8, 129.3, 129.2, 128.9, 128.7, 128.6, 128.6, 128.2, 128.1.