摘要：Two new [neougonins A ( 1 ) and B ( 2 )] and nine known prenylated flavonoids were isolated from the whole plants of Helminthostachys zeylanica . The structures of the new isolates were elucidated by extensive NMR techniques, including one and two dimensional (1D)- and (2D)-NMR experiments, as well as comparison with spectroscopic data of known analogous compounds. Moreover, compound 1 inhibited lipopolysaccharide (LPS)-induced nitric oxide (NO) production in RAW264.7 cells with an IC50 value of 3.32 µM.
