1H NMR (400 MHz, CDCl3) δ 7.84 (s, 1H), 7.64 – 7.57 (m, 6H), 7.53 (dd, J = 8.7, 6.4 Hz, 1H), 7.32 (d, J = 8.0 Hz, 4H), 2.46 (s, 6H). 13C{H} NMR (101 MHz, CDCl3) δ 141.63, 138.35, 137.09, 129.48, 129.06, 127.06, 125.74, 125.65, 21.09. m/z (GC-MS): 258。