1H-indol-5-yl-piperazin-1-yl-methanone derivatives

摘要

The present invention relates to compounds of formula I and their pharmaceutically acceptable salts wherein in formula I is: wherein R¹ to R⁴ are as defined in the description and claims. The compounds of the present invention are useful for the treatment and/or prevention of diseases which are associated with the modulation of histamine 3 (H3) receptors.