[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is an onium cation obtained by protonation of ammonia. It has a role as a human metabolite, a Saccharomyces cerevisiae metabolite, an Escherichia coli metabolite and a cofactor. It is a nitrogen hydride, an onium cation and a monovalent inorganic cation. It is a conjugate acid of an ammonia."}, {"from": "gpt", "value": "[NH4+1]"}]