“Isolation and Elucidation Structure of 28-Hydroxy-3-Friedelanone of Nyamplung (Callophyllum Inophyllum, Linn.) Leaves”. 2020. The Journal of Pure and Applied Chemistry Research 9 (2): 117-25. https://doi.org/10.21776/ub.jpacr.2020.009.02.518.