[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is an organoselenium compound obtained by the formal condensation of butane-1-selenol with pentanoic acid. It has a role as a metabolite."}, {"from": "gpt", "value": "[C][C][C][C][C][=Branch1][C][=O][Se][C][C][C][C]"}]