Compounds of formula (I) wherein R
F1
, R
F2
, Z, R
1
, R
2
, Ar, X and Y are as dcfined in thc specification as wcll as salts and pharmaceutical compositions including the compounds were prepared. These compounds are useful in therapy, in particular in the management of pain.
Compounds of formula (I) wherein RF1, RF2, Z, R1, R2, Ar, X and Y are as defined in the specification as well as salts and pharmaceutical compositions including the compounds were prepared. These compounds are useful in therapy, in particular in the management of pain.