1 H NMR ( CDCl 3 ) δ : 7 . 46 - 7 . 44 ( 2 H , m ) , 7 . 27 - 7 . 25 ( 1 H , m ) , 7 . 02 ( 1 H , s ) , 6 . 94 - 6 . 92 ( 2 H , m ) , 6 . 64 ( 1 H , s ) , 4 . 88 ( 2 H , s ) , 3 . 83 ( 3 H , s ) , 3 . 05 ( 1 H , q ) , 1 . 68 - 1 . 25 ( 8 H , m ) .