1 H NMR ( CDCl 3 ) δ : 7 . 28 - 7 . 63 ( m , 5 H ) , 7 . 03 ( s , 1 H ) , 6 . 84 ( s , 1 H ) , 6 . 62 ( s , 1 H ) , 3 . 78 - 3 . 82 ( t , 2 H ) , 3 . 19 - 3 . 24 ( t , 2 H ) , 3 . 09 ( m , 1 H ) , 0 . 88 - 1 . 94 ( m , 10 H ) .