Pyrimidine-4-carb­oxy­lic acid

The crystal structure of the title compound, C₅H₄N₂O₂, is built of acid mol­ecules located on a mirror plane. They form sheets stacked along the b-axis direction. The mol­ecules inter­act via O—H...N hydrogen bonds, forming [001] chains, and weak van der Waals inter­actions.