[{"from": "human", "value": "Describe this molecule. [C][Branch1][#Branch2][C][S][=Branch1][C][=O][=Branch1][C][=O][O-1][NH3+1]"}, {"from": "gpt", "value": "The molecule is the zwitterion formed from taurine by transfer of a proton from the sulfonyl to the amino group. It is the major species existing at physiological pH. It is a tautomer of a taurine."}]