| abstract |
The present invention relates to novel substituted xanthines of formula (I), tautomers thereof, stereoisomers thereof, and mixtures thereof, prodrugs thereof and salts thereof, which are very useful pharmacological properties, in particular the enzyme dipeptidyl peptidase-IV (DPP). -IV) has an inhibitory effect on activity.n n n Formula In n n n n n n n In Formula I above,n n n R 1 , R 2 and R 3 are as defined in claim 1. |