1 H NMR ( 400 MHz , CDCl 3 ) δ = 7 . 57 ( d , J = 9 Hz , 2 H ) , 7 . 37 ( dd , J = 4 , 0 . 8 Hz , 1 H ) , 7 . 29 ( d , J = 9 Hz , 2 H ) , 6 . 95 ( t , J = 6 Hz , 1 H ) , 6 . 89 ( dd , J = 4 , 0 . 8 Hz , 1 H ) , 5 . 09 ( br s , 1 H ) , 4 . 94 - 4 . 86 ( m , 1 H ) , 4 . 14 ( t , J = 8 . 8 Hz , 1 H ) , 3 . 94 - 3 . 85 ( m , 2 H ) , 3 . 85 - 3 . 73 ( m , 3 H ) , 3 . 27 ( dd , J = 11 , 6 Hz , 2 H ) , 1 . 28 - 1 . 24 ( m , 1 H ) , 1 . 03 - 0 . 97 ( m , 2 H ) , 0 . 66 - 0 . 59 ( m , 2 H )