1 H NMR ( 399 . 9 MHz , DMSO - d 6 ) δ 3 . 28 ( 4 H , m ) , 3 . 63 ( 4 H , m ) , 7 . 47 ( 1 H , d ) , 7 . 64 ( 1 H , m ) , 7 . 90 ( 1 H , m ) , 8 . 06 ( 1 H , m ) , 8 . 20 ( 1 H , d ) , 8 . 68 ( 1 H , m ) ; m / z = 414 [ M + H ] +.