1 H NMR ( 499 . 802 MHz , DMSO ) δ 2 . 62 ( 4 H , t ) , 3 . 62 ( 4 H , t ) , 3 . 85 - 3 . 89 ( 5 H , m ) , 7 . 16 - 7 . 22 ( 1 H , m ) , 7 . 22 - 7 . 28 ( 1 H , m ) , 7 . 54 ( 1 H , d ) , 7 . 57 - 7 . 62 ( 2 H , m ) , 8 . 25 ( 1 H , d ) ; m / z = 417 [ M + H ] +.