1H NMR (400 MHz, CDCl3) δ 7.55 (d, J = 7.1 Hz, 5H), 7.44 – 7.35 (m, 9H). 13C{1H} NMR (101 MHz, CDCl3) δ 168.9, 136.6, 133.3, 130.7, 130.5, 130.4, 130.1, 130.0, 129.7, 128.6, 128.4, 127.7.