1 H NMR ( 399 . 9 MHz , DMSO - d 6 ) δ 3 . 17 ( 4 H , t ) , 3 . 73 ( 4 H , t ) , 4 . 27 ( 2 H , t ) , 4 . 46 ( 2 H , t ) , 6 . 25 ( 1 H , d ) , 6 . 84 ( 2 H , d ) , 6 . 96 ( 2 H , d ) , 7 . 48 ( 1 H , d ) , 7 . 68 ( 1 H , d ) , 7 . 79 ( 1 H , d ) , 8 . 29 ( 1 H , d ) ; m / z = 459 [ M + H ] +.