A novel acrylic acid derivative was synthesized via acid hydrolysis of 4-((5-chloro-3-methyl-1-phenyl-1H-pyrazol-4-yl)methylene)-2-phenyloxazol-5(4H)-one in gl. acetic acid. The structure of the title compound was established on the basis of IR, ¹H NMR, ¹³C-NMR and mass spectral data.