[{"from": "human", "value": "Provide a brief overview of this molecule. [C][Branch1][=Branch1][C][=Branch1][C][=O][N][I]"}, {"from": "gpt", "value": "The molecule is a sulfhydryl alkylating reagent that forms covalent bonds with the thiol group of cysteines so the protein or peptide no longer forms disulfide bonds."}]