[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is a transition metal and a trace element in the body. It is important to the function of many enzymes including cytochrome c oxidase, monoamine oxidase and superoxide dismutase. Copper is commonly used in contraceptive intrauterine devices (IUD)."}, {"from": "gpt", "value": "[Cu]"}]