Anti-inflammatory labdane diterpenoids from Lagopsis supina.

Ten new labdane diterpenoids, lagopsins A-H (1-3, 5, 7-10) and 15-epi-lagopsins C and D (4, 6), together with five known labdane diterpenoids (11-15), were isolated from the whole plants of Lagopsis supina. The absolute configuration of lagopsin A (1) was determined by single-crystal X-ray crystallographic analysis. Compounds 7, 9, 13, and 15 exhibited moderate inhibition of nitric oxide production stimulated by lipopolysaccharide in BV-2 microglial cells with IC50 values in the range 14.9-34.9 μM.