abstract |
The present invention relates to substituted xanthines of general formula n n n n n n n n n n wherein R 1 to R 3 are defined as in claims 1 to 16 , the tautomers, the stereoisomers, the mixtures, the prodrugs thereof and the salts thereof which have valuable pharmacological properties, particularly an inhibiting effect on the activity of the enzyme dipeptidylpeptidase-IV (DPP-IV). |