State Key Laboratory of Drug Research, Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China.
Two new Lycopodium alkaloids, N-oxidehuperzine E (1) and N-oxidehuperzine F (2), along with two known alkaloids, huperzines E (3) and F (4), were isolated from Huperzia serrata (Thunb.) Trev. Their structures were elucidated by spectroscopic and chemical transformations.