Used primarily as an analytical reagent for the detection and determination of metal ions, especially in spectrophotometric analysis. It acts as a selective chromogenic agent, forming stable, colored complexes with certain transition metals, which allows for sensitive measurement in environmental and industrial samples. Its sulfhydryl group enhances binding affinity to heavy metals, making it useful in studies related to metal chelation and sensor development. Also investigated for potential use in pharmaceutical intermediates due to its heterocyclic structure and reactivity.