¹H NMR (400 MHz, CDCl₃) δ 9.19 (s, 1H), 8.30 (s, 1H), 8.15 (d, J = 8.4 Hz, 1H), 7.88 (d, J = 8.1 Hz, 1H), 7.72 (t, J = 7.6 Hz, 1H), 7.65 (d, J = 7.5 Hz, 2H), 7.58 (t, J = 7.5 Hz, 1H), 7.37 (d, J = 7.6 Hz, 2H), 2.74 (q, J = 7.5 Hz, 2H), 1.31 (t, J= 7.8 Hz, 3H). ¹³C{¹H} NMR (101 MHz, DMSO) δ 149.9, 147.1, 144.5, 135.2, 133.8, 133.0, 129.3, 129.1, 128.7, 128.1, 127.9, 127.3, 127.0, 28.6, 15.6.