Substituted pyrazolo[3,4-D]pyrimidines as cell cycle kinase...

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

07947694

ABSTRACT:
This invention comprises the novel compounds of formula (I)wherein R1, R2, R3, R4, R5, R6, X1and X2have defined meanings, having cell cycle kinase inhibiting enzymatic activity, their preparation, compositions containing them and their use as a medicine.

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