“…The timber of Soymida febrifuga contained no detectable level of limonoids and the bark contained ∼0.1% methyl angolensate ( 568 ). These results showed that Soymida was closely related to the African genus Khaya . Zhang et al concluded that the configuration at C-6 of mexicanolides, phragmalins, and khayanolides from Khaya senegalensis had a 6 S configuration while those from Swietenia species had a 6 R configuration, and then pointed out this difference implies a significant chemotaxonomy difference between the African mahogany genus Khaya and the genuine mahogany genus Swietenia .…”