1H NMR (400 MHz, CDCl3) δ 9.24 (s, 1H), 8.32 (s, 1H), 7.74 (t, J = 7.6 Hz, 3H), 7.61 – 7.42 (m, 5H), 2.87 (s, 3H). 13C{1H} NMR (101 MHz, CDCl3) δ 148.6, 146.3, 138.0, 136.9, 133.6, 133.5, 129.6, 129.1, 128.0, 127.4, 126.8, 126.1, 18.1.