| abstract |
The application relates to new substituted xanthines of general formula n n nwherein R 1 and R 2 are defined as in claims 1 to 11 , the tautomers, the enantiomers, the diastereomers, the mixtures thereof and the salts thereof, which have valuable pharmacological properties, particularly an inhibiting effect on the activity of the enzyme dipeptidylpeptidase-IV (DPP-IV). |