1 H NMR ( 400 MHz , CDCl 3 ) δ 7 . 52 ( d , J = 2 . 4 Hz , 1 H ) , 7 . 38 ( d , J = 1 . 9 Hz , 2 H ) , 7 . 35 ( t , J = 1 . 8 Hz , 1 H ) , 7 . 23 ( d , J = 2 . 4 Hz , 1 H ) , 4 . 99 ( t , J = 3 . 1 Hz , 1 H ) , 2 . 93 - 2 . 86 ( m , 1 H ) , 2 . 69 - 2 . 61 ( m , 1 H ) , 2 . 61 - 2 . 55 ( m , 2 H ) , 1 . 79 - 1 . 56 ( m , 4 H ) , 1 . 44 - 1 . 09 ( m , 44 H ) , 0 . 91 - 0 . 82 ( m , 3 H ) .