6-arylmethylprazolo[3,4-d]pyrimidines

Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Having -c- – wherein x is chalcogen – bonded directly to...

Reexamination Certificate

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C544S262000

Reexamination Certificate

active

07615558

ABSTRACT:
Described are 6-arylmethylpyrazolo[3,4-d]pyrimidines of the following formula:processes for their preparation and their use for producing medicaments for improving perception, concentration, learning and/or memory.

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