[{"from": "human", "value": "Please give me some details about this molecule. [C][C][=Branch1][C][=O][O-1].[C][C][=Branch1][C][=O][O-1].[Ni+2]"}, {"from": "gpt", "value": "Dull green odorless solid. Sinks and mixes slowly with water. (USCG, 1999)"}]