1 H NMR ( CD 3 OD ) δ : 7 . 48 - 7 . 46 ( 3 H , m ) , 7 . 39 - 7 . 37 ( 3 H , m ) , 7 . 15 - 7 . 09 ( 4 H , m ) , 6 . 52 ( 1 H , s ) , 5 . 01 ( 2 H , s ) , 3 . 45 - 3 . 42 ( 2 H , m ) , 2 . 95 - 2 . 93 ( 1 H , q ) , 2 . 69 - 2 . 63 ( 2 H , m ) , 2 . 30 ( 3 H , m ) , 1 . 60 - 1 . 27 ( 8 H , m ) .