[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is an odorless green solid. Sinks in and mixes with water. (USCG, 1999)"}, {"from": "gpt", "value": "[C][=Branch1][C][=O][O-1].[C][=Branch1][C][=O][O-1].[Ni+2]"}]