The present invention relates to substituted xanthines of general formula
wherein R
1
to R
4
are defined as in claim
1
, the tautomers and the stereoisomers thereof, mixtures thereof, the prodrugs and the salts thereof which have valuable pharmacological properties, particularly an inhibiting effect on the activity of the enzyme dipeptidylpeptidase-IV (DPP-IV).
本发明涉及一般式为的取代
黄嘌呤,其中R1至R4的定义如权利要求1所述,其互变异构体和立体异构体,其混合物,以及具有有价值的药理学性质,特别是对酶二肽基肽酶-IV(
DPP-IV)活性的抑制作用的前药和盐。