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A series of tacrine-NO donor hybrid compounds are synthesized and evaluated for cholinesterase inhibitory activity, cognition improving activity, and hepatotoxicity. The pharmacological results indicate that hybrid compounds 1, 2, and 3a potently inhibit cholinesterase in vitro and significantly improve the scopolamine-induced cognition impairment, whereas an analogue (3h) of 2 without the NO donor moiety does not. Compared to tacrine, 1 and 2 show much less hepatotoxicity. Molecular modeling studies suggest that 2 may interact with the catalytic and the peripheral anionic site of acetylcholinesterase.
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Fang et al. (2008) studied this question.
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