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The title compound, C19H16N4O3, was synthesized by the reaction of 5-amino-3-meth­yl-1-phenyl­pyrazole with 4-nitro­benzaldehyde and Medrum's acid in glycol under microwave irradiation. X-ray crystal structure analysis reveals that the dihydro­pyridine ring adopts a distorted half-chair conformation. In the crystal structure, the mol­ecules exist as N—H...O hydrogen-bonded dimers.
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