Heterocyclic compounds, methods for the preparation thereof,...

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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C514S334000, C546S256000, C546S257000

Reexamination Certificate

active

10651023

ABSTRACT:
The compounds of the present invention are of formula I:wherein A, R3, R4is as defined herein, are useful as ligands for nicotinic receptors.

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