1 H NMR ( 399 . 9 MHz , DMSO - d 6 ) δ 1 . 33 ( 3 H , t ) , 1 . 74 ( 2 H , m ) , 1 . 94 ( 2 H , m ) , 2 . 99 ( 1 H , m ) , 3 . 14 ( 2 H , m ) , 4 . 32 ( 2 H , q ) , 4 . 44 ( 2 H , m ) , 7 . 47 ( 1 H , m ) , 7 . 59 ( 1 H , m ) , 7 . 67 ( 1 H , d ) , 7 . 83 ( 2 H , m ) , 8 . 25 ( 1 H , d ) ; m / z = 420 [ M + H ] +.