1 H NMR ( 400 MHz , CDCl 3 ) δ 7 . 45 - 7 . 14 ( m , 5 H ) , 4 . 71 ( t , J = 3 . 2 Hz , 1 H ) , 4 . 62 - 4 . 50 ( m , 1 H ) , 3 . 74 - 3 . 50 ( m , 2 H ) , 3 . 50 - 3 . 40 ( m , 1 H ) , 3 . 40 - 3 . 25 ( m , 1 H ) , 3 . 18 - 3 . 06 ( m , 1 H ) , 3 . 05 - 2 . 95 ( m , 1 H ) , 2 . 89 ( s , 3 H ) , 2 . 75 - 2 . 65 ( m , 1 H ) , 2 . 55 - 2 . 47 ( m , 1 H ) , 2 . 43 - 2 . 30 ( m , 1 H ) , 2 . 25 - 2 . 15 ( m , 2 H ) , 2 . 06 - 1 . 94 ( m , 1 H )