1 H NMR ( 399 . 9 MHz , DMSO - d 6 ) δ 3 . 07 ( 2 H , t ) , 3 . 17 ( 4 H , m ) , 3 . 75 ( 4 H , m ) , 3 . 79 ( 3 H , s ) , 4 . 15 ( 2 H , t ) , 6 . 14 ( 1 H , d ) , 6 . 88 ( 2 H , d ) , 6 . 97 ( 2 H , d ) , 7 . 31 ( 1 H , d ) , 7 . 43 - 7 . 69 ( 2 H , m ) , 8 . 22 ( 1 H , d ) ; m / z = 455 [ M + H ] +.