1H NMR (400 MHz, CDCl3) δ 7.52 (t, J = 7.3 Hz, 1H), 7.43 – 7.30 (m, 11H), 2.40 (s, 6H). 13C{H} NMR (101 MHz, CDCl3) δ 141.78, 141.66, 135.31, 130.31, 130.04, 129.83, 127.82, 127.59, 127.26, 125.76, 20.53. m/z (GC-MS): 258。