[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. 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."}, {"from": "gpt", "value": "[C][Branch1][=Branch1][C][=Branch1][C][=O][N][I]"}]