The present invention relates to compounds of formula I ##STR00001## wherein R.sup.1 to R.sup.4 are as defined in the description and claims, and pharmaceutically acceptable salts thereof. The compounds are useful for the treatment and/or prevention of diseases which are associated with the modulation of H3 receptors.

 
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> Substituted 4,5,6,7-tetrahydrobenzthiazol-2-ylamine compounds

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