1H NMR (400 MHz, CDCl3) δ 8.26 (d, J = 7.3 Hz, 2H), 7.59 (t, J = 7.2 Hz, 1H), 7.53 – 7.44 (m, 3H), 7.31 – 7.20 (m, 5H), 7.15 (d, J = 4.4 Hz, 2H), 7.09 (t, J = 8.3 Hz, 2H). 13C{1H} NMR (101 MHz, CDCl3) δ 183.0, 162.3 (d, J = 249.1 Hz), 144.2, 138.6, 137.0, 133.2 (d, J = 3.3 Hz), 133.0, 130.8, 129.4 (d, J = 8.7 Hz), 129.1, 128.7, 128.5, 128.5, 128.2, 116.1 (d, J = 23.1 Hz).