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The cyclization reaction of 3-(4-ethoxyphenyl)-1-(naphthalen-1-yl)prop-2-en-1-one (1) using hydrazine hydrate in acetic acid medium culminates, resulting in the title compound 1-[5-(4-ethoxyphenyl)-3-(naphthalen-1-yl)-4,5-dihydro-1H-pyrazol-1-yl]ethan-1-one (2). The structure of the newly synthesized compound is determined by IR, 1H-NMR, 13C-NMR and mass spectral data. In order to evaluate the putative molecular interactions, the title compound (2) is docked against the active site of Cytochrome P450 14α-sterol demethylase (CYP51) from Mycobacterium tuberculosis.