¹H NMR (400 MHz, CDCl₃) δ 8.25 (d, J = 8.6 Hz, 1H), 8.16 (d, J = 7.8 Hz, 2H), 7.95 (d, J = 8.6 Hz, 1H), 7.86 (d, J = 7.8 Hz, 2H), 7.83-7.76 (m, 2H), 7.60-7.40 (m, 7H). ¹³C NMR (100 MHz, CDCl₃) δ 156.0, 145.6, 140.8, 139.5, 139.4, 137.1, 131.2, 130.4, 129.3, 128.8, 127.7, 127.4, 127.2, 126.2, 118.1.