1 H NMR ( 700 . 03 MHz , DMSO - d 6 ) δ 1 . 86 - 1 . 90 ( 2 H , m ) , 2 . 60 ( 2 H , t ) , 2 . 67 ( 3 H , s ) , 2 . 74 ( 2 H , t ) , 3 . 63 ( 2 H , s ) , 3 . 72 ( 2 H , t ) , 3 . 74 ( 2 H , t ) , 7 . 22 - 7 . 24 ( 1 H , m ) , 7 . 25 ( 1 H , d ) , 7 . 26 - 7 . 28 ( 4 H , m ) , 8 . 01 ( 1 H , d ) ; m / z = 355 [ M + H ] +.