Abstract
Seven lignans were isolated from 70% aqueous acetone extracts of the twigs and leaves of Horsfieldiakingii. Among these, new compounds 1-3 were identified by spectroscopic techniques, with horsfielenigans A and B (1 and 2) being particularly noteworthy for their rare β-benzylnaphthalene skeleton, where compound 1 contains an oxabicyclo[3,2,1]octane moiety. In vitro evaluation of bioactivity against nitric oxide (NO) production in LPS-activated RAW264.7 macrophages revealed inhibitory effects by 1 (IC50 = 7.3 μM) and 2 (IC50 = 9.7 μM).
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