1 H NMR ( 600 MHz , CDCl 3 ) δ = 8 . 47 ( d , J = 5 . 4 Hz , 1 H ) , 7 . 80 ( d , J = 6 . 0 Hz , 1 H ) , 7 . 70 ( t , J = 7 . 2 Hz , 1 H ) , 7 . 66 ( d , J = 7 . 2 Hz , 1 H ) , 7 . 35 ( d , J = 4 . 2 Hz , 1 H ) , 7 . 27 ( d , J = 7 . 2 Hz , 1 H ) , 7 . 25 ( d , J = 9 . 0 Hz , 2 H ) , 6 . 76 ( d . J = 4 . 2 Hz , 2 H ) , 6 . 69 ( d , J = 9 . 0 Hz , 2 H ) , 4 . 81 - 4 . 77 ( m , 1 H ) , 4 . 13 - 4 . 08 ( m , 2 H ) , 4 . 05 - 3 . 97 ( m , 3 H ) , 3 . 81 - 3 . 78 ( m , 1 H ) , 3 . 74 - 3 . 70 ( m , 1 H ) , 3 . 65 - 3 . 61 ( m , 1 H )