[{"from": "human", "value": "Generate a molecule based on this description. The molecule is an alkanesulfonic acid in which the alkyl group directly linked to the sulfo functionality is methyl. It has a role as an Escherichia coli metabolite. It is an alkanesulfonic acid and a one-carbon compound. It is a conjugate acid of a methanesulfonate."}, {"from": "gpt", "value": "[C][S][=Branch1][C][=O][=Branch1][C][=O][O]"}]