Used as an intermediate in organic synthesis, particularly in the preparation of pharmaceuticals and fine chemicals. Its aldehyde and carboxylic acid functional groups allow for diverse chemical transformations, such as condensation reactions and cyclizations, making it valuable in constructing complex molecules. Commonly employed in the development of active pharmaceutical ingredients (APIs) where aromatic aldehydes are needed for coupling or heterocycle formation. Also utilized in the synthesis of dyes and specialty polymers due to its bifunctional reactivity.