[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is d-ribose with the hydroxy group substituted for a methylthio group at position C-5. It has a role as a metabolite. It is functionally related to a D-ribose."}, {"from": "gpt", "value": "[C][S][C][C@H1][Branch1][O][C@H1][Branch1][#Branch1][C@H1][Branch1][Ring1][C][=O][O][O][O]"}]