TUG-891

1H NMR (400 MHz, CDCl3) δ 7.34 (dd, J = 9.7, 2.7 Hz, 1H), 7.28–7.24 (m, 1H), 7.21 (s, 4H), 7.11–7.02 (m, 3H), 6.78 (d, J = 8.6 Hz, 2H), 4.89 (s, 2H), 2.88 (t, J = 7.7 Hz, 2H), 2.63 (t, J = 7.7 Hz, 2H), 2.39 (s, 3H). 

13C NMR (101 MHz, CDCl3) δ 178.0, 163.5, 161.0, 156.9, 137.2, 137.2, 136.7, 136.6, 136.6, 132.7, 131.6, 131.5, 129.2, 129.1, 129.0, 115.3, 115.1, 114.9, 114.8, 114.6, 67.6, 35.6, 29.7, 21.1