Compounds of the Formula I: ##STR00001## wherein m, n, k, A, X, Y, Z, Ar, R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are as defined herein. The compounds are useful as 5-HT6 receptor antagonists. Also provided are compositions comprising, methods of using, and methods of making the subject compounds.

 
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> Melanin-concentrating hormone antagonist

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