[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is the (R)-oxido diastereomer of L-methionine S-oxide. It has a role as an Escherichia coli metabolite. It is an enantiomer of a D-methionine (S)-S-oxide. It is a tautomer of a L-methionine (R)-S-oxide zwitterion."}, {"from": "gpt", "value": "[C][S@@][=Branch1][C][=O][C][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][N]"}]