abstract |
The present invention relates to substituted xanthines of general formula (I) (Wherein R 1 to R 4 are as defined in claim 1), tautomers, enantiomers, diastereomers, mixtures thereof, prodrugs and salts thereof, which are useful pharmacological It has an inhibitory effect on properties, in particular the activity of the enzyme dipeptidyl peptidase-IV (DPP-IV). |