[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a propane-1,2-diol. It has a role as a human metabolite and an Escherichia coli metabolite. It is an enantiomer of a (S)-propane-1,2-diol."}, {"from": "gpt", "value": "[C][C@H1][Branch1][Ring1][C][O][O]"}]