1H NMR (CDCl3, 500 MHz): d ppm 7.20 (s, 2H), 7.33 (m, 4H), 7.42 (m, 2H), 7.50 (m, 4H), 7.54 (s, 2H), 7.62 (m, 2H), 7.73 (m, 4H), 7.77 (s, 4H), 7.81 (m, 2H)
13C NMR (CDCl3, 125 MHz): d ppm 119.5, 120.5, 123.0, 125.6, 127.3, 127.5, 127.7, 128.3, 128.7, 130.6, 135.6, 137.2, 138.9, 139.8, 140.7, 148.0