1 H NMR ( 499 . 8 MHz , DMSO - d 6 ) δ 1 . 32 ( 3 H , d ) , 2 . 39 - 2 . 57 ( 4 H , m ) , 3 . 47 ( 1 H , q ) , 3 . 58 ( 4 H , t ) , 7 . 22 - 7 . 27 ( 1 H , m ) , 7 . 30 - 7 . 35 ( 4 H , m ) , 7 . 53 ( 1 H , d ) , 8 . 20 ( 1 H , d ) ; m / z = 393 [ M + H ] +.