1H NMR (400 MHz, CDCl3) δ 7.55 – 7.45 (m, 8H), 7.42 – 7.34 (m, 7H). 13C{1H} NMR (101 MHz, CDCl3) δ 169.5, 136.3, 131.8, 130.0, 130.0, 129.1, 128.6, 128.5, 127.8, 126.2.