Abstract
A new gedunin, three new mexicanolides and three new phragmalin-type limonoids named Andirolides A ( 1), B ( 2), C ( 3), D ( 4), E ( 5), F ( 6), and G ( 7) were isolated from oil of the flower of Carapa guianensis Aublet (Meliaceae). Their absolute stereostructures were determined by 2D NMR and CD spectra, and single-crystal X-ray analysis, and all compounds were confirmed to have the C-17β H configuration. Considering the similarity in CD spectra between Andirolide G ( 7) and the xyloccensins reported by Wu, we concluded that the structures of xyloccensins should be revised so as to have the absolute configuration of 17 R.
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