1 H NMR ( 499 . 802 MHz , DMSO ) δ 2 . 52 ( 4 H , t ) , 3 . 53 ( 2 H , s ) , 3 . 60 ( 4 H , t ) , 3 . 77 ( 3 H , s ) , 6 . 90 - 6 . 95 ( 1 H , m ) , 6 . 98 ( 1 H , d ) , 7 . 21 - 7 . 26 ( 1 H , m ) , 7 . 31 - 7 . 35 ( 1 H , m ) , 7 . 56 ( 1 H , d ) , 8 . 22 ( 1 H , d ) ; m / z = 393 [ M + H ] +.