前曾报道自千层塔[Huperzia serrata Thunb.(Trev)=Lycopodium serratum Thunb(Trev.)]中分得具有胆碱酯酶抑制活性的新生物碱——石杉碱甲、石杉碱乙、甲基石杉碱乙及已知生物碱8-deoxyserratinine,serratinine,lycodoline及lycoclavine。为进一步阐明该植物的化学成分,我们对其三萜成分进行了研究。从浙江安吉产的千层塔植物中分到六个石松三萜,其中一个为新化合物,经下述方法推定为serratenediol-21-acetate(Ⅰ)。另五 Previously, the novel alkaloids with cholinesterase inhibitory activity, Huperzia serrata Thunb. (Trev) = Lycopodium serratum Thunb (Trev.), have been reported to be assigned to huperzine A, huperzine B, Methyl-huperzine B and the known alkaloids 8-deoxyserratinine, serratinine, lycodoline, and lycoclavine. To further elucidate the chemical composition of the plant, we studied its triterpenoid composition. From the Melaleuca plant in Anji, Zhejiang, six Tricholoma matsutake plants, one of which is a new compound, were classified as serratenediol-21-acetate (I) by the following method. Another five