[{"from": "human", "value": "Describe this molecule. [C][S][=Branch1][C][=O][=Branch1][C][=O][C][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1]"}, {"from": "gpt", "value": "The molecule is an L-alpha-amino acid zwitterion obtained by transfer of a proton from the carboxy to the amino group of methionine sulfone; major miscrospecies at pH 7.3. It is a tautomer of a L-methionine sulfone."}]