1 H NMR ( 399 . 9 MHz , DMSO - d 6 ) δ 1 . 33 ( 3 H , t ) , 1 . 76 ( 2 H , m ) , 2 . 11 ( 2 H , m ) , 3 . 55 ( 2 H , m ) , 3 . 98 ( 2 H , m ) , 4 . 29 ( 2 H , q ) , 4 . 83 ( 1 H , m ) , 7 . 13 ( 2 H , m ) , 7 . 66 ( 1 H , d ) , 7 . 92 ( 2 H , m ) , 8 . 27 ( 1 H , d ) ; m / z = 436 [ M + H ] +.