1H NMR (400 MHz, CDCl3) δ 7.85 (s, 1H), 7.61 (dd, J = 16.6, 7.7 Hz, 6H), 7.55 – 7.47 (m, 5H), 1.42 (s, 18H). 13C{H} NMR (101 MHz, CDCl3) δ 150.34, 141.52, 138.35, 129.03, 126.86, 125.87, 125.72, 34.54, 31.38. m/z (GC-MS): 342。