1 H NMR ( CDCl 3 ) δ : 7 . 29 - 7 . 77 ( m , 6 H ) , 7 . 00 ( s , 1 H ) , 6 . 77 ( s , 1 H ) , 4 . 11 ( bs , 1 H ) , 3 . 73 ( bs , 1 H ) , 3 . 49 ( bs , 1 H ) , 2 . 94 - 2 . 98 ( m , 1 H ) , 2 . 38 - 2 . 50 ( m , 4 H ) , 1 . 14 - 1 . 66 ( m , 8 H ) .