Wan Hanafi, Wan Nur Huda, et al. “Chemical Diversity of Indole Alkaloids from Malaysian Kopsia Species (Apocynaceae) and Their Biological Activities”. Journal of Science and Mathematics Letters, vol. 12, no. 2, May 2024, pp. 34-49, https://doi.org/10.37134/jsml.vol12.2.3.2024.