4-Pyridinecarboxaldehyde, with the chemical formula C6H5NO, is an organic compound that belongs to the class of pyridine derivatives. It consists of a pyridine ring substituted with a formyl group (CHO) at the 4-position. This compound is utilized in various chemical reactions and synthetic pathways due to its unique reactivity and structural features. It serves as a versatile building block in organic synthesis for the preparation of pharmaceuticals, agrochemicals, and specialty chemicals.