Tu, Nguyen, Nguyen Hieu, Nguyen Hoa, and Nguyen Thu. “Phenols and Triterpenoids from an Ethyl Acetate Extract of the Bark of Calophyllum Pisiferum”. VNUHCM Journal of Advanced Research in Natural Sciences 9, no. 4 (December 31, 2025): 3494-3501. Accessed April 7, 2026. https://arns.vnuhcmjournal.com.vn/index.php/arns/article/view/1446.