1 H NMR ( 700 . 03 MHz , DMSO - d 6 ) δ 2 . 46 ( 4 H , t ) , 2 . 68 ( 3 H , s ) , 3 . 58 ( 4 H , t ) , 4 . 39 ( 1 H , s ) , 7 . 21 - 7 . 23 ( 2 H , m ) , 7 . 31 ( 1 H , d ) , 7 . 33 ( 4 H , t ) , 7 . 47 ( 4 H , d ) , 8 . 05 ( 1 H , d ) ; m / z = 417 [ M + H ] +.