From Encyclopedia of Medicinal Plants
Corydalis ambigua is a tuberous early flowering east Asian flowering plant species. Its exact native range is obscure due to taxonomic confusion.<ref name=GRIN/> It is one of the sources of the drug tetrahydropalmatine.
Corydalis ambigua contains a variety of alkaloids including corynoline, acetylcorynoline d-corydalin, dl-tetrahydropalmatine, protopine, tetrahydrocoptisine, dl-tetrahydrocoptisine, d-corybulbine and allo-crytopine.<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref><ref>Template:Cite journal</ref><ref>Template:Cite journal</ref>
Chemical derivatives of tetrahydroprotoberberines present in Corydalis ambigua have been studied as potential ways to increase pain tolerance and for treating drug addiction.<ref name=Zhen>Template:Cite journal</ref> Further, they may represent a category of neurotransmitter stabilizers which have potential use in broad range of psychotic and neurological disorders.<ref name=Zhen/>
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