The aim of this study was to reveal acetyl cholinesterase (AchE) and butyryl cholinesterase (BchE) inhibitory activities of Zaleya pentandra. The aerial parts of the plant were air, freeze-dried and powdered. The extraction was carried out with methanol at room temperature for 24 h. The extract was concentrated on rotavapor and fractioned by column chromatography. The isolation and purification afforded amorphous solid which was subjected to physical, chemical and spectroscopic techniques i.e., UV, IR, H-NMR, "C-NMR and HREI-MS for the structure elucidation of the isolated compound. The compound was concluded as "Pentandradione" a novel compound. AchE and BchE inhibitory activities were estimated. The result showed that the isolated extract possessed significant activity against butyryl cholinesterase as compared to standard eserine while the extract lacks acetyl cholinesterase inhibitory activity.
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