1H NMR (400 MHz, CDCl3) δ 7.30 (d, J = 7.4 Hz, 4H), 7.24-7.15 (m, 6H), 1.85 (s, 6H); 13C{H} NMR (101 MHz, CDCl3) δ 143.3, 137.1, 131.0, 129.8, 127.8, 126.0, 22.5。