¹H NMR (400 MHz, CDCl₃) δ 8.23-8.14 (m, 2H), 8.07 (d, J = 7.6 Hz, 2H), 7.85 (d, J = 8.6 Hz, 1H), 7.81 (d, J = 8.1 Hz, 1H), 7.71 (t, J = 7.7 Hz, 1H), 7.50 (t, J = 7.5 Hz, 1H). ¹³C NMR (100 MHz, CDCl₃) δ 157.3, 148.2, 139.5, 136.8, 129.7, 129.6, 127.5, 127.5, 127.1, 126.1, 118.9, 21.4.