1 H NMR ( 399 . 9 MHz , DMSO - d 6 ) δ 2 . 25 - 2 . 30 ( 1 H , m ) , 2 . 34 - 2 . 43 ( 1 H , m ) , 3 . 61 - 3 . 90 ( 4 H , m ) , 5 . 34 - 5 . 37 ( 1 H , m ) , 7 . 03 - 7 . 04 ( 2 H , m ) , 7 . 32 ( 1 H , d ) , 8 . 25 ( 1 H , d ) , 8 . 41 - 8 . 43 ( 2 H , m ) ; m / z = 351 [ M + H ] +.