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The extracts of stemonaceous flora have been utilized for centuries as treatments for respiratory ailments in established Asian traditions. Additional effects associated with these plants (or discrete compounds isolated from them) include insecticidal,
anthelmintic, antitussive, and various neurochemical actions (11¨C17), although the molecular mechanisms responsible for their activities have rarely been identified (18). Four structurally related isolated Stemona alkaloid molecules are depicted in
Fig. 1. The reported antitussive activities of two isolated Stemona alkaloid compounds, neostenine 3 and neotuberostemonine 4 against citric acid-induced cough in guinea pig animal models have validated the traditional medicine uses for these plants (19, 20). More recently, antitussive activity has been confirmed for additional isolated Stemona alkaloid compounds (21¨C23).The diversity of reported traditional uses combined with demonstrated in vivo activity of several members supported the pursuit of an appropriately simplified Stemona alkaloid structure for
speculative screening.
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