1 H NMR ( 399 . 9 MHz , DMSO - d 6 ) δ 1 . 64 - 1 . 71 ( 2 H , m ) , 1 . 89 ( 2 H , m ) , 2 . 75 - 2 . 79 ( 1 H , m ) , 3 . 07 - 3 . 14 ( 2 H , m ) , 4 . 39 - 4 . 42 ( 2 H , m ) , 6 . 59 - 6 . 70 ( 3 H , m ) , 7 . 09 ( 1 H , m ) , 7 . 66 ( 1 H , d ) , 8 . 24 ( 1 H , d ) , 9 . 24 ( 1 H , s ) ; m / z = 364 [ M + H ] +.