The present invention refers to chemical compounds of formula (I): (Formula I); as well as pharmaceutically acceptable salts, solvates and esters thereof, wherein R1 to R4 have the significance given in claim 1. They can be used in the form of pharmaceutical preparations for the treatment or prevention of disorders of the central nervous system, damage to the central nervous system, cardiovascular disorders, gastrointestinal disorders, diabetes, obesity and sleep apnoea.
The present invention relates to compounds of formula (I)
1
as well as pharmaceutically acceptable salts, solvates and esters thereof. These compounds can be used to prepare pharmaceutical compositions for the treatment or prevention of disorders of the central nervous system, damage to the central nervous system, cardiovascular disorders, gastrointestinal disorders, diabetes, obesity and sleep apnoea.