1H NMR (400 MHz, CDCl3) δ 8.58 (s, 1H), 8.30 (d, J = 8.3 Hz, 2H), 8.19 (t, J = 7.2 Hz, 3H), 7.93 (d, J = 8.6 Hz, 1H), 7.57 – 7.48 (m, 3H), 3.99 (s, 3H). 13C NMR (101 MHz, CDCl3) δ 166.7, 159.3, 150.1, 139.0, 138.1, 130.7, 130.0, 129.9, 129.3, 129.0, 127.8, 126.3, 122.9, 119.7, 52.4.