Serratene-Type Triterpenoids from Huperzia serrata

Abstract
Seven new and 15 known serratene-type triterpenoids were isolated from the whole plant of Huperzia serrata. The structures of these new triterpenoids were elucidated as 21α-hydroxyserrat-14-en-3β-yl p-dihydrocoumarate (1), 21α-hydroxyserrat-14-en-3β-yl dihydrocaffeate (2), 21α-hydroxyserrat-14-en-3β-yl propanedioic acid monoester (3), 3α,21α-dihydroxyserrat-14-en-24-oic acid (4), 16-oxo-3α,21β-dihydroxyserrat-14-en-24-al (5), 16-oxo-3α,21β-dihydroxyserrat-14-en-24-oic acid (6), and 16-oxo-21β-hydroxyserrat-14-en-3α-yl acetate (7), respectively, by means of spectroscopic analysis.