[{"from": "human", "value": "Create a molecule with the structure as the one described. The molecule is the S-oxide derivative of methionine. It is a biomarker of oxidative stress. It has a role as a biomarker and a human metabolite."}, {"from": "gpt", "value": "[C][S][=Branch1][C][=O][C][C][C][Branch1][=Branch1][C][=Branch1][C][=O][O][N]"}]