5-Formylpyrimidine (CAS 10070-92-5), with the molecular formula C?H?N?O and a molecular weight of 108.10 g/mol, is a pyrimidine derivative featuring an aldehyde (-CHO) functional group at the C5 position. As a critical organic building block, it is extensively utilized in the synthesis of pharmaceuticals, agrochemicals, and functional materials. For stability, it typically requires sealed storage under cool, dry conditions to prevent aldehyde group oxidation or moisture-induced degradation, ensuring reliability in subsequent synthetic processes.