[{"from": "human", "value": "Describe this molecule. [O-1][S][=Branch1][C][=O][=Branch1][C][=O][O-1].[Ni+2]"}, {"from": "gpt", "value": "The molecule is a metal sulfate having nickel(2+) as the metal ion. It has a role as an allergen. It contains a nickel(2+)."}]