Used primarily as a reagent in organic synthesis, particularly in the preparation of heterocyclic compounds and pharmaceuticals. It serves as a building block for synthesizing guanidine-containing molecules, which are important in medicinal chemistry due to their biological activity. Commonly employed in the development of kinase inhibitors and antiviral agents. Also utilized in peptide chemistry as a protecting group or intermediate. Its thiol group allows for further functionalization, enabling conjugation or cyclization reactions in drug design. Frequently applied in research settings for modifying biomolecules and developing new bioactive compounds.