1 H NMR ( 499 . 802 MHz , DMSO ) δ 2 . 58 ( 4 H , t ) , 3 . 58 ( 4 H , t ) , 3 . 95 ( 2 H , s ) , 7 . 56 ( 1 H , d ) , 7 . 61 - 7 . 66 ( 1 H , m ) , 7 . 74 ( 1 H , d ) , 8 . 06 ( 1 H , d ) , 8 . 13 ( 1 H , d ) , 8 . 23 ( 1 H , d ) , 8 . 53 ( 1 H , d ) , 9 . 31 ( 1 H , s ) ; m / z = 414 [ M + H ] +.