Khayanolides from African mahogany Khaya senegalensis (Meliaceae): A revision

The structures and absolute configurations of five khayanolides 1-5, isolated from Khaya senegalensis were determined by spectroscopic methods including MS, NMR and X-ray crystallography. Four previously reported limonoids isolated from the same plant species need revision from khayanolides 6, 7 to 1, 2 and to phragmalin derivatives 8, 9 to 3, 4 respectively.