[{"from": "human", "value": "What can you tell me about this molecule? [C][C][S][=Branch1][C][=O][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is an alkanesulfonic acid in which the alkyl group directly linked to the sulfo functionality is ethyl. It is a conjugate acid of an ethanesulfonate."}]