[{"from": "human", "value": "Please give me some details about this molecule. [C][=Branch1][C][=O][Branch1][C][O-1][O-1].[Fe+2]"}, {"from": "gpt", "value": "The molecule is a carbonate salt in which the counter-ion is iron in the +2 oxidation state. It is a carbonate salt, a one-carbon compound, an iron molecular entity and a carbonate mineral."}]