Impurities of Donepezil
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United States of America Patent
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N/A
Issued Date -
Dec 3, 2009
app pub date -
May 18, 2007
filing date -
May 18, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention relates to impurities of donepezil, or a pharmaceutically acceptable salt thereof, which may be produced during synthesis and storage of donepezil, or a pharmaceutically-acceptable salt thereof, and to methods of identifying such impurities. The invention also relates to the use of these impurities in analytical techniques and to product that contain certain low levels of these impurities in particular the following impurities are disclosed: formula (I) and formula (II).
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