The invention concerns a compound of formula (I): ##STR00001## Wherein A, l, m, n, R1 and R2 are as defined herein. The compounds of this invention are useful as medicaments, particularly, in the treatment of disorders improved by modulation of the histamine H.sub.3 receptor.

 
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> Exendins and exendin agonists modified with polyamino acids

> Piperidine-piperazine ligands for neurotransmitter receptors
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