Compounds of formula (I): ##STR00001## wherein: X is a group of formula (B): ##STR00002## and R.sup.1, R.sup.2, R.sup.4, n, x, y and z are as defined within are described.Processes for their preparation and their use in the treatment of disorders mediated by the neuropeptide Y5 receptor in a warm-blooded animal, such as a human being, are also described.