Coptisine is an

alkaloid Alkaloids are a class of basic, naturally occurring organic compounds that contain at least one nitrogen atom. This group also includes some related compounds with neutral and even weakly acidic properties. Some synthetic compounds of similar ...

found in Chinese goldthread (''

Coptis chinensis ''Coptis chinensis'', the Chinese goldthread, is a species of goldthread flowering plant native to China. Etymology *''Coptis chinensis'' Franch. var. ''chinensis''

''),

greater celandine ''Chelidonium majus'', the greater celandine, is a perennial herbaceous flowering plant in the poppy family Papaveraceae. One of two species in the genus ''Chelidonium'', it is native to Europe and western Asia and introduced widely in North Ame ...

, and opium. Famous for the bitter taste that it produces, it is used in Chinese herbal medicine along with the related compound

berberine Berberine is a quaternary ammonium salt from the protoberberine group of benzylisoquinoline alkaloids found in such plants as ''Berberis vulgaris'' (barberry), '' Berberis aristata'' (tree turmeric), '' Mahonia aquifolium'' (Oregon grape), '' Hyd ...

for digestive disorders caused by bacterial infections.

References

Isoquinoline alkaloids Benzodioxoles Quaternary ammonium compounds {{alkaloid-stub