The invention relates to urea- and urethane-substituted acylureas and to their physiologically tolerated salts and physiologically functional derivatives. In particular, the invention relates to the compounds of the formula I ##STR00001## wherein the radicals have meanings described herein, and to their physiologically tolerated salts and to processes for their preparation. The compounds are suitable for example as antidiabetics.

 
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> Substituted pyrazolo[4,3-d]pyrimidines and their use as PDE-5 inhibitors

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