1 H NMR ( 499 . 8 MHz , DMSO - d 6 ) δ 1 . 83 - 1 . 90 ( 2 H , m ) , 2 . 61 ( 2 H , t ) , 2 . 72 ( 2 H , t ) , 3 . 61 ( 2 H , s ) , 3 . 71 - 3 . 75 ( 4 H , m ) , 7 . 05 ( 2 H , t ) , 7 . 26 - 7 . 29 ( 2 H , m ) , 7 . 49 ( 1 H , d ) , 8 . 22 ( 1 H , d ) ; m / z = 395 [ M + H ] +.