¹H NMR (400 MHz, CDCl₃) δ 8.18-8.12 (m, 4H), 7.84 (d, J = 8.5 Hz, 1H), 7.66-7.63 (m, 2H), 7.53 (t, J = 7.5 Hz, 2H), 7.46 (t, J = 7.1 Hz, 1H), 1.38 (d, J = 6.9 Hz, 6H). ¹³C NMR (100 MHz, CDCl₃) δ 156.6, 147.1, 146.9, 139.8, 136.4, 129.6, 129.5, 129.1, 128.8, 127.5, 127.2, 123.5, 118.9, 34.1, 23.9