¹H NMR (400 MHz, CDCl₃) δ 8.11 (t, J = 9.5 Hz, 2H), 7.81-7.73 (m, 3H), 7.69 (t, J = 7.7 Hz, 1H), 7.52-7.43 (m, 2H), 7.16 (t, J = 3.7 Hz, 1H). ¹³C NMR (100 MHz, CDCl₃) δ 152.3, 148.1, 145.3, 136.7, 129.9, 129.2, 128.7, 128.1, 127.5, 127.2, 126.2, 126.0, 117.7.