¹H NMR (400 MHz, CDCl₃) δ 8.82 (d, J = 2.2 Hz, 2H), 8.03 (t, J = 2.0 Hz, 1H), 7.41 (t, J = 7.9 Hz, 2H), 7.24-7.20 (m, 2H), 7.18-7.15 (m, 2H), 7.01 – 6.94 (m, 2H), 3.88 (s, 6H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 160.2, 147.1, 139.1, 136.5, 132.9, 130.1, 119.6, 113.5, 113.0, 55.3。