¹H NMR (400 MHz, CDCl₃) δ 7.61-7.23 (m, 9H), 5.55 (dd, J = 9.4, 1.1 Hz, 2H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 148.9, 141.0, 139.9, 133.6, 129.5, 128.3, 128.2, 128.1, 127.9, 114.6。