1 H NMR ( 499 . 8 MHz , DMSO - d 6 ) δ 1 . 85 - 1 . 92 ( 2 H , m ) , 2 . 63 ( 2 H , t ) , 2 . 76 ( 2 H , t ) , 3 . 61 ( 2 H , s ) , 3 . 70 - 3 . 74 ( 5 H , m ) , 3 . 76 ( 2 H , t ) , 6 . 83 ( 1 H , t ) , 6 . 94 ( 1 H , d ) , 7 . 19 ( 1 H , t ) , 7 . 26 ( 1 H , d ) , 7 . 49 ( 1 H , d ) , 8 . 21 ( 1 H , d ) ; m / z = 407 [ M + H ] +.