1 H NMR ( 399 . 9 MHz , DMSO - d 6 ) δ 1 . 30 ( 2 H , m ) , 1 . 91 ( 2 H , m ) , 2 . 59 ( 1 H , m ) , 3 . 16 ( 2 H , m ) , 3 . 30 ( 3 H , s ) , 4 . 11 ( 2 H , m ) , 7 . 61 ( 1 H , d ) , 8 . 22 ( 1 H , d ) ; m / z = 301 [ M + H ] +.