[{"from": "human", "value": "Provide a brief overview of this molecule. [C][S@@][=Branch1][C][=O][C][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1]"}, {"from": "gpt", "value": "The molecule is zwitterionic form of L-methionine (R)-S-oxide. It is a tautomer of a L-methionine (R)-S-oxide."}]