¹H NMR (400 MHz, CDCl₃) δ 7.57 (d, J = 7.6 Hz, 1H), 7.36 (d, J = 7.7 Hz, 1H), 7.21 (dd, J = 18.0, 7.7 Hz, 2H), 7.12 (dd, J = 17.6, 11.0 Hz, 1H), 5.75 (d, J = 16.7 Hz, 1H), 5.39 (d, J = 10.2 Hz, 1H). ¹³C{H} NMR (101 MHz, CDCl₃) δ135.7, 133.2, 133.1, 129.6, 128.8, 126.8, 126.6, 116.5。