ethyl 3,4-dibromo-2,5-dioxo-2H-pyrrole-1(5H)-carboxylate is a small molecule reagent with a dibromo maleimide. The unsaturated dibromo motif is a covalent reagent for thiol groups, and may be used to label cysteine residues in proteins. The presence of two leaving groups on this molecule allows it to bind two thiols at a time.
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