[A new lignan from stem bark of Syringa pinnatifolia]

One new lignan, named Z-pinnatifolin A, along with ten known analogues, were isolated from the stem bark of Syringa pinnatifolia by various chromatographic methods. Their structures were extensively determined on basis of MS and NMR spectroscopic data analyses, and comparison with those in literature. Among them, compounds 3,4, and 8-11 were isolated from this genus for the first time, and 5-7 were isolated from the specie for the first time. Compound 1 showed a moderate inhibition on NO production in BV-2 cells. The present study provides a preliminary data for clarification of bioactive ingredients of S.pinnatifolia with anti-myocardial ischemic effect.