[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is an alkyl sulfate that is the monomethyl ester of sulfuric acid. It is a one-carbon compound and an alkyl sulfate. It is a conjugate acid of a methyl sulfate(1-)."}, {"from": "gpt", "value": "[C][O][S][=Branch1][C][=O][=Branch1][C][=O][O]"}]