Abulencia, A.B. and Amor, E.C. 2024. Demethylzeylasteral from Costus dubius (Afzel.)  K. Schum Leaves Inhibits Cyclooxygenase (COX-2) In vitro. Tropical Journal of Natural Product Research (TJNPR). 8, 12 (Dec. 2024), 9399 – 9405. DOI:https://doi.org/10.26538/tjnpr/v8i12.7.