Abietane diterpenoids from Lycopodium complanatum.

Five new abietane diterpenoids (complanatins A-E, 1-5) have been isolated from the club moss Lycopodium complanatum, along with two known abietane diterpenoids (xanthoperol and sugiol). Their structures were determined by comprehensive analysis of 1D, 2D NMR, CD and HRESIMS data. The cytotoxic effects of five compounds (1-4, 7) were evaluated in three human lung cancer cell lines (MSTO-211H, NCI-H2052 and NCI-H226). Compounds 3 and 4 exhibited cytotoxic activities against the three cell lines. In addition, a plausible biogenetic pathway of compounds 1-7 was proposed.