1 H NMR ( 399 . 9 MHz , DMSO - d 6 ) δ 1 . 71 ( 2 H , m ) , 2 . 06 ( 2 H , m ) , 3 . 53 ( 2 H , m ) , 3 . 95 ( 2 H , m ) , 4 . 60 ( 1 H , m ) , 6 . 40 ( 3 H , m ) , 7 . 07 ( 1 H , m ) , 7 . 64 ( 1 H , d ) , 8 . 25 ( 1 H , d ) , 9 . 36 ( 1 H , s ) ; m / z = 380 [ M + H ] +.