abstract |
The present invention provides a novel compound exhibiting an inhibitory action on the activity of the enzyme dipeptidyl peptidase-IV (DPP-IV) and a pharmaceutical composition containing the same. Xanthine represented by the following general formula (I) (wherein R 1 to R 4 are equal to those defined in claim 1), tautomers, stereoisomers, mixtures, pro Drug or salt. [Selection figure] None |