Novel heterocyclic aromatic compounds are provided that are useful in stimulating endogenous production or release of growth hormone, said compounds having the general structure of formula I ##STR00001## wherein R.sub.1, R.sub.1', R.sub.2, R.sub.3, R.sub.4, Xa, Y, Z and n are as described herein.The compounds provided herein are useful in treating obesity, osteoporosis (improving bone density) and in improving muscle mass and muscle strength.

 
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> Alkyne compounds with MCH antagonistic activity and medicaments comprising these compounds

> Substituted azabicyclo hexane derivatives as muscarinic receptor antagonists
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