Used as an intermediate in the synthesis of fluorescent dyes and optical brighteners due to its conjugated aromatic structure and hydroxyl group that enhance light absorption and emission properties. Employed in the development of sensors for metal ions, particularly aluminum and zinc, where the compound acts as a chelating agent with detectable fluorescence changes upon binding. Applied in organic synthesis to construct more complex heterocyclic systems, especially in pharmaceuticals and agrochemicals, where the aldehyde group allows for further functionalization via condensation or reduction reactions. Also investigated for use in photovoltaic materials as a building block in organic semiconductors.