1H NMR (400 MHz, CDCl3) δ 7.56 – 7.48 (m, 4H), 7.47 – 7.35 (m, 8H), 7.22 – 7.15 (m, 2H). 13C{1H} NMR (101 MHz, CDCl3) δ 169.5, 161.7 (d, J = 247.8 Hz), 136.3, 130.1, 130.0, 128.6, 128.4, 127.9 (d, J = 8.7 Hz), 127.7 (d, J = 3.3 Hz), 116.0 (d, J = 22.8 Hz).