[{"from": "human", "value": "Provide a brief overview of this molecule. [C][O][S][=Branch1][C][=O][=Branch1][C][=O][C]"}, {"from": "gpt", "value": "The molecule is a stable, colorless, combustible liquid that emits toxic fumes of sulfoxide when heated to decomposition. Methyl methanesulfonate is used for laboratory purposes as a catalyst in chemical synthesis and has been tested clinically as a cancer chemotherapeutic agent. This substance is an alkylating agent and acts as a mutagen by altering and damaging DNA and is reasonably anticipated to be a human carcinogen. (NCI05)"}]