XANTHINE DERIVATIVE, PRODUCTION AND USE THEREOF AS A MEDICAMENT

摘要

The invention relates to substituted xanthines of general formula (I) wherein R1 - R4 are defined as cited in claim 1, the tautomers, stereoisomers, mixtures, prodrugs and salts thereof which exhibit valuable pharmacological properties, particularly an inhibitory effect on the activity of the dipeptidylpeptidase-IV enzyme.