1H NMR (400 MHz, CDCl3) δ 7.52 – 7.43 (m, 4H), 7.41 – 7.32 (m, 6H), 3.17 (s, 3H). 13C{1H} NMR (101 MHz, CDCl3) δ 170.9, 136.3, 129.8, 129.8, 128.6, 128.5, 24.3.