Mempening (L. bancanus) is a species of the family Fagaceae. It can be found on hillsides and sandy mountains to clay, but can also be found in peat swamp forests. The purpose of this study was to isolate and test the toxicity of secondary metabolites from the n-hexane fraction obtained from the leaves of the L. bancanus plant. Isolation was carried out by maceration method for 72 hours. A pure…