XANTHINE DERIVATIVE, PREPARATION THEREOF AND USE THEREOF AS PHARMACEUTICAL COMPOSITION

摘要

PROBLEM TO BE SOLVED: To provide new dipeptidylpeptidase IV activity inhibitors.

SOLUTION: The xanthine derivatives are substituted xanthines expressed by general formula (I) [wherein, R1to R4are each defined as in claim 1], their tautomers, stereoisomers, mixtures, prodrugs and salts (they show a valuable pharmaceutical property, especially, an inhibitory effect on the enzymatic activity of dipeptidylpeptidase IV).

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