A new sesquiterpene lactone from the roots of Lasianthus acuminatissimus.

To study the active constituents for the treatment of rheumatoid arthritis from the ethyl acetate extracts of the roots of Lasianthus acuminatissimus Merr.Various chromatographic techniques were used to separate and purify the constituents. Their structures were established on the basis of 1D, 2D NMR and HRMS spectroscopic analyses and their preliminary evaluation of anti-inflammation effect on the release of beta-glucuronidase was carried out.Eight compounds were isolated and identified as lasianthuslactone A (1), codonolactone (2), 2,5-dimethoxy-1, 4-benzoquinone (3), uncargenin A (4), nonadecyl alcohol (5), 13-docosenoic acid (6), tetracosanoic acid (7) and beta-sitosterol (8). Compound 3 showed a significant inhibitory effect on release of beta-glucuronidase rat polymorphous nuclear leukocytes activated by platelet activating factor (PAF).Compound 1 is a new one, the others were isolated from the plant for the first time and 3 is one of active anti-inflammation compound in the plant.