[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a red-violet crystalline solid. Vinegar-like odor. (USCG, 1999)"}, {"from": "gpt", "value": "[C][C][=Branch1][C][=O][O-1].[C][C][=Branch1][C][=O][O-1].[Co+2]"}]