1 H NMR ( 399 . 9 MHz , DMSO - d 6 ) δ 1 . 72 ( 2 H , m ) , 1 . 99 ( 2 H , m ) , 3 . 09 ( 2 H , t ) , 3 . 43 ( 2 H , m ) , 3 . 79 ( 3 H , s ) , 4 . 18 ( 4 H , m ) , 5 . 12 ( 1 H , s ) , 6 . 13 ( 1 H , d ) , 6 . 90 ( 2 H , d ) , 7 . 30 ( 1 H , d ) , 7 . 41 ( 2 H , d ) , 7 . 65 ( 1 H , d ) , 8 . 23 ( 1 H , d ) ; m / z = 488 [ M + H ] +.