1 H NMR ( 399 . 9 MHz , DMSO - d 6 ) δ 1 . 58 ( 2 H , m ) , 1 . 80 ( 2 H , m ) , 3 . 27 ( 2 H , m ) , 3 . 71 ( 1 H , m ) , 3 . 92 ( 2 H , m ) , 5 . 10 ( 4 H , m ) , 6 . 95 ( 2 H , m ) , 7 . 39 ( 12 H , m ) ; m / z = 416 [ M - H ] +.