1 H NMR ( 700 . 03 MHz , DMSO - d 6 ) δ 1 . 34 - 1 . 38 ( 2 H , m ) , 2 . 02 ( 2 H , q ) , 2 . 34 ( 2 H , t ) , 2 . 42 ( 4 H , t ) , 3 . 57 ( 4 H , t ) , 4 . 01 ( 1 H , t ) , 7 . 09 - 7 . 13 ( 4 H , m ) , 7 . 32 - 7 . 35 ( 4 H , m ) , 7 . 58 ( 1 H , d ) , 8 . 23 ( 1 H , d ) ; m / z = 517 [ M + H ] +.