[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a monoatomic monocation obtained from sodium. It has a role as a human metabolite and a cofactor. It is an alkali metal cation, an elemental sodium, a monovalent inorganic cation and a monoatomic monocation."}, {"from": "gpt", "value": "[Na+1]"}]