1H NMR (400 MHz, CDCl3): δ 7.95 (d, J = 8.6 Hz, 2H), 7.17 (dd, J = 17.1, 10.5 Hz, 1H), 6.94 (d, J = 8.6 Hz, 2H), 6.42 (d, J = 17.0 Hz, 1H), 5.86 (d, J = 10.5 Hz, 1H), 4.10 (q, J = 7.0 Hz, 2H), 1.44 (t, J = 7.0 Hz, 3H). 13C NMR (100 MHz, CDCl3): δ 189.2, 163.0, 132.1, 131.0, 130.0, 129.1, 114.2, 63.7, 14.6.