[{"from": "human", "value": "Could you give me a brief overview of this molecule? [Ni+2]"}, {"from": "gpt", "value": "The molecule is a nickel cation in which the nickel carries a double positive charge. It has a role as a cofactor. It is a divalent metal cation, a metal cation allergen, a nickel cation and a monoatomic dication."}]