[{"from": "human", "value": "Provide a description of this molecule. [C][O][S][=Branch1][C][=O][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is an organosulfate oxoanion that is the conjugate base of methyl sulfate; major species at pH 7.3. It is a conjugate base of a methyl sulfate."}]