Phosphodiesterase 4 inhibitors

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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C544S277000

Reexamination Certificate

active

07342021

ABSTRACT:
PDE4 inhibition is achieved by novel compounds of the Formula I:wherein R1and R2are as defined herein.

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