¹H NMR (700 MHz, CDCl₃) δ 7.37 (m, J = 7.1 Hz, 3H), 7.23 (t, J = 7.3 Hz, 2H), 7.19 (t, J = 7.2 Hz, 1H), 7.08 (d, J = 7.3 Hz, 2H), 7.05 (d, J = 7.3 Hz, 2H), 5.86 (tdd, J = 6.4, 10.4, 16.9 Hz, 1H), 5.09 (d, J = 10.1 Hz, 1H), 5.04 (d, J = 17.1 Hz, 1H), 4.30 (d, J = 6.3 Hz, 2H), 3.45 (s, 2H).