New prenyl flavanone and diarylbutanol from stem bark and their -glucosidase inhibitory activity.

One new prenyl flavanone (), (2)-8-prenyl-5,6-dihydroxy-7-methoxyflavanone, and one new diarylbutanol (), (7')-3'-hydroxy-linderagatin-A, were isolated from the stem bark of (Annonaceae), along with five known compounds, eriodictyol (), quercetin (), paprazine (), --caffeoyltyramine (), and --feruloyltyramine (). Their structures were determined through extensive spectroscopic analyses and comparison with the literature. The -glucosidase inhibitory potential of was evaluated.

Bougainvinones NP, three new flavonoids from Bougainvillea spectabilis.

In an effort to identify natural bioactive compounds, three new flavonoids (1-3) and six known compounds (4-9) were isolated from the stem bark of Bougainvillea spectabilis. The structures of these compounds were accomplished using comprehensive spectroscopic methods, including 1D and 2D NMR spectra with references to the literatures, as well as high-resolution mass spectrometric analysis. Their cytotoxicity against KB and HeLa S-3 cell lines was also evaluated.

Bougainvinones A-H, Peltogynoids from the Stem Bark of Purple Bougainvillea spectabilis and Their Cytotoxic Activity.

Eight new peltogynoids, named bougainvinones A-H (1-8), were obtained from the stem bark of Bougainvillea spectabilis. Their structures were elucidated by means of physical data (1D and 2D NMR, HRESIMS) and single-crystal X-ray crystallographic analyses. The peltogynoids, a rare type of modified flavonoids, are reported for the first time from this species of the genus Bougainvillea.