1H NMR (400 MHz, CDCl3) δ 7.58-7.51 (m, 4H), 7.43-7.35 (m, 4H), 7.32-7.26 (m, 2H), 7.14 (t, 2H); 13C{H} NMR (101 MHz, CDCl3) δ 137.3, 128.7, 128.7, 127.6, 126.5。