Used in bioconjugation processes, particularly in the development of antibody-drug conjugates (ADCs). Its structure enables site-specific attachment of cytotoxic agents to monoclonal antibodies, improving therapeutic efficacy and reducing off-target effects. The presence of a reactive pyrrole-dione group allows for stable linkage formation with thiol-containing biomolecules via Michael addition. Commonly employed in pharmaceutical research to construct highly stable, homogenous conjugates for targeted cancer therapies. Also utilized in diagnostic probes and protein labeling due to its selective reactivity and compatibility with aqueous biological systems.