A variety of diarylpyrazole derivatives III-VI were synthesized and structurally characterized using FTIR, H and C NMR spectroscopy, and in case of compound VIb by X-ray single crystal analysis. The in vitro biological studies revealed that seven of the diarylpyrazole derivatives IIIa, IIIb, IIId, IIIe, IVa, IVb and IVd are highly potent inhibitors of acetylcholinesterase enzyme with IC values of 0.48 ± 0.
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