abstract |
The invention relates to substituted xanthines of general formula (I), wherein R1 and R2 have the meaning cited in claims 1 to 11. The invention also relates to the tautomers, enantiomers, diastereomers, mixtures and salts thereof, which have valuable pharmacological properties, especially an inhibiting action on the activity of the enzyme dipeptidylpeptidase-IV (DPP-IV). |