1 H NMR ( 300 . 13 MHz , DMSO - d 6 ) δ 1 . 92 - 1 . 97 ( 4 H , m ) , 2 . 46 ( 4 H , t ) , 3 . 21 ( 4 H , t ) , 3 . 40 ( 2 H , s ) , 3 . 59 ( 4 H , t ) , 6 . 50 ( 2 H , d ) , 7 . 10 ( 2 H , d ) , 7 . 57 ( 1 H , d ) , 8 . 23 ( 1 H , d ) ; m / z = 432 [ M + H ] +.