Furan fragment isomerized andirobin-type limonoids from the stem barks of Khaya senegalensis.

A new andirobin-type limonoid with modified furan ring, khaysenelide K (1), together with a known analogue (2), was isolated from the stem barks of Khaya senegalensis. The structure and absolute configuration of 1 were elucidated by a combination of 1D and 2D NMR, HRESIMS, and single-crystal X-ray diffraction using mirror Cu-Kα radiation. Compound 1 showed moderate NO inhibitory activity in LPS-activated RAW 264.7 macrophages with IC50 value of 27.74 ± 0.68 μM. [ABSTRACT FROM AUTHOR]