Used as a key intermediate in the synthesis of pharmaceuticals and bioactive molecules, particularly in the development of anti-inflammatory and anticancer agents. Its ethynyl group enables click chemistry reactions, making it valuable in drug discovery for constructing complex organic frameworks via copper-catalyzed azide-alkyne cycloaddition (CuAAC). Also employed in materials science to functionalize polymers and surfaces, enhancing their reactivity or enabling conjugation with biomolecules. Its carboxylic acid functionality allows for easy esterification or amide formation, facilitating incorporation into larger molecular systems.