¹H NMR (400 MHz, CDCl₃): δ 7.84 (s, 1H), 7.74 (d, J = 7.7 Hz, 1H), 7.47 (d, J = 7.9 Hz, 1H), 7.35 (t, J = 7.8 Hz, 1H), 7.03 (dd, J = 17.1, 10.6 Hz, 1H), 6.38 (d, J = 17.1 Hz, 1H), 5.90 (d, J = 10.6 Hz, 1H). ¹³C NMR (100 MHz, CDCl₃): δ 189.7, 138.8, 134.9, 132.9, 131.9, 131.0, 129.9, 128.7, 126.7.