¹H NMR (400 MHz, CDCl₃) δ 8.76 (d, J = 2.2 Hz, 2H), 7.99 (t, J = 2.2 Hz, 1H), 7.63-7.50 (m, 4H), 7.31 (d, J = 7.3 Hz, 2H), 7.03 (d, J = 8.8 Hz, 2H), 3.87 (s, 3H), 2.43 (s, 3H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 159.8, 146.2, 146.1, 138.1, 136.5, 136.2, 134.9, 132.3, 130.22, 129.8, 128.3, 127.0, 114.6, 55.4, 21.2