1 H NMR ( 399 . 9 MHz , DMSO - d 6 ) δ 1 . 70 - 1 . 73 ( 2 H , m ) , 2 . 04 - 2 . 11 ( 2 H , m ) , 3 . 41 - 3 . 47 ( 2 H , m ) , 4 . 22 - 4 . 25 ( 2 H , m ) , 5 . 49 ( 1 H , s ) , 7 . 55 ( 1 H , t ) , 7 . 67 ( 1 H , d ) , 7 . 71 ( 1 H , m ) , 7 . 87 ( 1 H , m ) , 7 . 95 ( 1 H , m ) , 8 . 25 ( 1 H , d ) ; m / z = 389 [ M + H ] +.