[{"from": "human", "value": "Generate a molecule based on this description. The molecule is an alkanesulfonic acid in which the sulfonic acid group is attached to a propan-2-yl group. It is a conjugate acid of a propane-2-sulfonate."}, {"from": "gpt", "value": "[C][C][Branch1][C][C][S][=Branch1][C][=O][=Branch1][C][=O][O]"}]