[{"from": "human", "value": "Provide a description of this molecule. [C][=Branch1][C][=O][O-1].[C][=Branch1][C][=O][O-1].[Cu+2]"}, {"from": "gpt", "value": "The molecule is a blue crystalline powder. Sinks and mixes with water. (USCG, 1999)"}]