“Cytotoxic Activity of Xanthones from the Stem Bark of Cratoxylum sumatranum: http://www.doi.org/10.26538/tjnpr/v7i9.9”, Trop J Nat Prod Res, vol. 7, no. 9, pp. 3908–3910, Oct. 2023, Accessed: Jan. 16, 2026. [Online]. Available: https://www.tjnpr.org/index.php/home/article/view/2593