1 H NMR ( 300 MHz , DMSO - d 6 ) δ 1 . 11 - 1 . 57 ( 5 H , m ) , 1 . 62 - 1 . 93 ( 5 H , m ) , 2 . 39 - 2 . 58 ( 1 H , m ) , 3 . 36 - 3 . 54 ( 2 H , m ) , 4 . 55 - 4 . 70 ( 2 H , m ) , 6 . 69 ( 1 H , t , J = 6 . 8 Hz ) , 7 . 20 - 7 . 30 ( 2 H , m ) , 7 . 37 - 7 . 46 ( 2 H , m ) , 7 . 60 ( 1 H , d , J = 6 . 4 Hz ) , 7 . 75 ( 1 H , d , J = 6 . 4 Hz ) .