1 H NMR ( 700 . 03 MHz , DMSO - d 6 ) δ 3 . 16 ( 4 H , t ) , 3 . 72 ( 4 H , t ) , 7 . 49 ( 1 H , d ) , 7 . 71 - 7 . 72 ( 1 H , m ) , 7 . 85 - 7 . 86 ( 1 H , m ) , 8 . 16 ( 1 H , d ) , 8 . 21 ( 1 H , d ) , 8 . 23 ( 1 H , d ) , 8 . 27 ( 1 H , d ) , 8 . 53 ( 1 H , d ) ; m / z = 497 [ M + H ] +.