1H NMR (400 MHz, CDCl3) δ 8.09 (s, 1H), 7.48-7.40 (m, 5H), 2.45 (s, 3H); 13C NMR (101 MHz, CDCl3) δ 147.7, 133.5, 132.4, 129.9, 129.9, 128.9, 14.0