1 H NMR ( 499 . 802 MHz , DMSO ) δ 2 . 58 ( 4 H , t ) , 3 . 64 ( 4 H , t ) , 3 . 82 ( 2 H , s ) , 6 . 44 - 6 . 46 ( 1 H , m ) , 6 . 94 - 7 . 03 ( 2 H , m ) , 7 . 33 ( 1 H , t ) , 7 . 48 ( 1 H , d ) , 7 . 58 ( 1 H , d ) , 8 . 25 ( 1 H , d ) , 10 . 84 ( 1 H , s ) ; m / z = 402 [ M + H ] +.