| abstract |
The present invention relates to chemical compounds of formula (I) (see formula) as well as pharmaceutically acceptable salts, solvates and esters thereof, wherein R1 to R8 have the meanings defined in claim 1. They can be used in form of pharmaceutical preparations for the treatment of disorders of the central nervous system, lesions of the central nervous system, cardiovascular disorders, gastrointestinal disorders, diabetes insipidus, obesity and night apnea. |