1 H NMR ( 700 . 03 MHz , DMSO - d 6 ) δ 2 . 45 ( 4 H , t ) , 3 . 62 ( 4 H , t ) , 3 . 72 ( 3 H , s ) , 4 . 34 ( 1 H , s ) , 6 . 88 - 6 . 90 ( 2 H , m ) , 7 . 20 - 7 . 24 ( 1 H , m ) , 7 . 31 - 7 . 33 ( 2 H , m ) , 7 . 35 - 7 . 37 ( 2 H , m ) , 7 . 44 - 7 . 45 ( 2 H , m ) , 7 . 54 ( 1 H , d ) , 8 . 25 ( 1 H , d ) ; m / z = 469 [ M + H ] +.