The present invention relates to compounds of formula I
wherein A and R1 to R4 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.
[EN] The present invention relates to compounds of formula (I), wherein A and R1 to R4 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. [FR] L'invention concerne des composés de formule (I), dans laquelle A et R1 à R4 sont tels que définis dans la description et les revendications. Elle concerne également des sels de ces composés pharmaceutiquement acceptable. Ces composés sont utiles dans le traitement et/ou la prévention de maladies associées à la modulation des récepteurs H3.