Used as a key intermediate in the synthesis of conductive polymers and organic electronic materials. Its functional groups enable polymerization reactions that form conjugated thiophene-based structures, which are essential in organic semiconductors, solar cells, and thin-film transistors. The ester and hydroxyl groups allow further chemical modifications, making it valuable in designing functional organic molecules for optoelectronic applications. Also explored in sensor development due to its redox-active properties and ability to chelate metal ions.