RESUMEN
AIM@#To investigate the chemical constituents from the whole plants of Phlegmariurus fargesii.@*METHOD@#Compounds were isolated by repeated silica gel column chromatography. Their structures were elucidated by spectroscopic methods and chemical correlation. The acetylcholinesterase (AChE) inhibitory activity of the isolated compounds was evaluated.@*RESULTS@#A new Lycopodium alkaloid, lycopodine N-oxide (1), along with lycopodine (2), 8,15-dehydrolycopodine (3), 6α-hydroxylycopodine (4), deacetyllycoclavine (5), N-methylhuperzine B (6), lycodine (7), and phlegmarine (8), was isolated.@*CONCLUSION@#Compound 1 is a new Lycopodium alkaloid, and compound 3 was obtained from nature for the first time. Other alkaloids are isolated from this plant for the first time.