¹H NMR (400 MHz, CDCl₃) δ 7.59-7.55 (m, 2H), 7.52-7.41 (m, 3H), 7.32 (dd, J = 5.1, 1.2 Hz, 1H), 7.08 (dd, J = 5.1, 3.7 Hz, 1H), 7.04 (dd, J = 3.6, 1.2 Hz, 1H), 5.72 (d, J = 0.9 Hz, 1H), 5.37 (d, J = 0.9 Hz, 1H). ¹³C{H} NMR (101 MHz, CDCl₃) δ 144.7, 143.3, 141.0, 128.2, 128.1, 128.0, 127.2, 126.4, 125.0, 113.5。