¹H NMR (400 MHz, CDCl₃) δ 8.76 (s, 2H), 7.98 (d, J = 1.8 Hz, 1H), 7.58 (d, J = 8.7 Hz, 4H), 7.03 (d, J = 8.7 Hz, 4H), 3.87 (s, 6H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 159.9, 145.8, 132.1, 130.2, 128.3, 114.6, 55.4。