[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is the dimethyl ester of sulfuric acid. It has a role as an alkylating agent and an immunosuppressive agent."}, {"from": "gpt", "value": "[C][O][S][=Branch1][C][=O][=Branch1][C][=O][O][C]"}]